diff --git a/autotests/coronatest.h b/autotests/coronatest.h
index 8d5b3861c..2010b0bbb 100644
--- a/autotests/coronatest.h
+++ b/autotests/coronatest.h
@@ -39,7 +39,7 @@ class SimpleCorona : public Plasma::Corona
     Q_OBJECT
 
 public:
-    explicit SimpleCorona(QObject * parent = 0);
+    explicit SimpleCorona(QObject * parent = nullptr);
     ~SimpleCorona();
 
     QRect screenGeometry(int) const Q_DECL_OVERRIDE;
@@ -51,7 +51,7 @@ class SimpleApplet : public Plasma::Applet
     Q_OBJECT
 
 public:
-    explicit SimpleApplet(QObject *parent = 0, const QString &serviceId = QString(), uint appletId = 0);
+    explicit SimpleApplet(QObject *parent = nullptr, const QString &serviceId = QString(), uint appletId = 0);
 private:
     QTimer m_timer;
 };
@@ -61,7 +61,7 @@ class SimpleContainment : public Plasma::Containment
     Q_OBJECT
 
 public:
-    explicit SimpleContainment(QObject *parent = 0, const QString &serviceId = QString(), uint appletId = 0);
+    explicit SimpleContainment(QObject *parent = nullptr, const QString &serviceId = QString(), uint appletId = 0);
 private:
     QTimer m_timer;
 };
@@ -71,7 +71,7 @@ class SimpleNoScreenContainment : public Plasma::Containment
     Q_OBJECT
 
 public:
-    explicit SimpleNoScreenContainment(QObject *parent = 0, const QString &serviceId = QString(), uint appletId = 0);
+    explicit SimpleNoScreenContainment(QObject *parent = nullptr, const QString &serviceId = QString(), uint appletId = 0);
 };
 
 class CoronaTest : public QObject
diff --git a/autotests/dynamictreemodel.h b/autotests/dynamictreemodel.h
index 283d6ed3f..24bba1c62 100644
--- a/autotests/dynamictreemodel.h
+++ b/autotests/dynamictreemodel.h
@@ -52,7 +52,7 @@ class DynamicTreeModel : public QAbstractItemModel
     Q_OBJECT
 
 public:
-    DynamicTreeModel(QObject *parent = 0);
+    DynamicTreeModel(QObject *parent = nullptr);
 
     QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
     QModelIndex parent(const QModelIndex &index) const;
@@ -99,7 +99,7 @@ class ModelChangeCommand : public QObject
     Q_OBJECT
 public:
 
-    explicit ModelChangeCommand(DynamicTreeModel *model, QObject *parent = 0);
+    explicit ModelChangeCommand(DynamicTreeModel *model, QObject *parent = nullptr);
 
     virtual ~ModelChangeCommand() {}
 
@@ -144,7 +144,7 @@ class ModelInsertCommand : public ModelChangeCommand
 
 public:
 
-    explicit ModelInsertCommand(DynamicTreeModel *model, QObject *parent = 0);
+    explicit ModelInsertCommand(DynamicTreeModel *model, QObject *parent = nullptr);
     virtual ~ModelInsertCommand() {}
 
     virtual void doCommand();
@@ -186,7 +186,7 @@ class ModelResetCommand : public ModelMoveCommand
 {
     Q_OBJECT
 public:
-    explicit ModelResetCommand(DynamicTreeModel *model, QObject *parent = 0);
+    explicit ModelResetCommand(DynamicTreeModel *model, QObject *parent = nullptr);
 
     virtual ~ModelResetCommand();
 
@@ -202,7 +202,7 @@ class ModelResetCommandFixed : public ModelMoveCommand
 {
     Q_OBJECT
 public:
-    explicit ModelResetCommandFixed(DynamicTreeModel *model, QObject *parent = 0);
+    explicit ModelResetCommandFixed(DynamicTreeModel *model, QObject *parent = nullptr);
 
     virtual ~ModelResetCommandFixed();
 
diff --git a/autotests/modeltest.h b/autotests/modeltest.h
index 9b1eaadc3..c89e3bcce 100644
--- a/autotests/modeltest.h
+++ b/autotests/modeltest.h
@@ -51,7 +51,7 @@ class ModelTest : public QObject
     Q_OBJECT
 
 public:
-    explicit ModelTest(QAbstractItemModel *model, QObject *parent = 0);
+    explicit ModelTest(QAbstractItemModel *model, QObject *parent = nullptr);
 
 private Q_SLOTS:
     void nonDestructiveBasicTest();
diff --git a/examples/dataengines/customDataContainers/httpContainer.h b/examples/dataengines/customDataContainers/httpContainer.h
index 1e6e3a206..1fc4fe76d 100644
--- a/examples/dataengines/customDataContainers/httpContainer.h
+++ b/examples/dataengines/customDataContainers/httpContainer.h
@@ -40,7 +40,7 @@ class HttpContainer : public Plasma::DataContainer
     Q_OBJECT
 
 public:
-    HttpContainer(const QUrl &url, QObject *parent = 0);
+    HttpContainer(const QUrl &url, QObject *parent = nullptr);
 
     void fetchUrl(bool reload = true);
 
diff --git a/examples/dataengines/dataEngineTracker/dataenginetracker.h b/examples/dataengines/dataEngineTracker/dataenginetracker.h
index feeca2a50..ae8b5662f 100644
--- a/examples/dataengines/dataEngineTracker/dataenginetracker.h
+++ b/examples/dataengines/dataEngineTracker/dataenginetracker.h
@@ -35,7 +35,7 @@ class DataEngineTracker : QObject
     Q_OBJECT
 
 public:
-    DataEngineTracker(Plasma::DataEngine *engine, QObject *parent = 0);
+    DataEngineTracker(Plasma::DataEngine *engine, QObject *parent = nullptr);
 
 public Q_SLOTS:
     void dataUpdated(const QString &source, const Plasma::DataEngine::Data &data);
diff --git a/examples/shell/customcorona.h b/examples/shell/customcorona.h
index 5a11067ea..5c2ea0b45 100644
--- a/examples/shell/customcorona.h
+++ b/examples/shell/customcorona.h
@@ -29,7 +29,7 @@ class CustomCorona : public Plasma::Corona
     Q_OBJECT
 
 public:
-    explicit CustomCorona(QObject * parent = 0);
+    explicit CustomCorona(QObject * parent = nullptr);
     QRect screenGeometry(int id) const;
 
 public Q_SLOTS:
diff --git a/src/declarativeimports/calendar/calendar.h b/src/declarativeimports/calendar/calendar.h
index b0bbc7e7f..17783a4bc 100644
--- a/src/declarativeimports/calendar/calendar.h
+++ b/src/declarativeimports/calendar/calendar.h
@@ -137,7 +137,7 @@ public:
     };
     Q_ENUM(DateMatchingPrecision)
 
-    explicit Calendar(QObject *parent = 0);
+    explicit Calendar(QObject *parent = nullptr);
 
     // Displayed date
     QDate displayedDate() const;
diff --git a/src/declarativeimports/calendar/calendardata.h b/src/declarativeimports/calendar/calendardata.h
index 860d22b16..5b5395c99 100644
--- a/src/declarativeimports/calendar/calendardata.h
+++ b/src/declarativeimports/calendar/calendardata.h
@@ -47,7 +47,7 @@ public:
     Q_ENUM(Type)
     Q_DECLARE_FLAGS(Types, Type)
 
-    explicit CalendarData(QObject *parent = 0);
+    explicit CalendarData(QObject *parent = nullptr);
 
 Q_SIGNALS:
     void startDateChanged();
diff --git a/src/declarativeimports/calendar/daysmodel.h b/src/declarativeimports/calendar/daysmodel.h
index c2423a53d..636beb5a8 100644
--- a/src/declarativeimports/calendar/daysmodel.h
+++ b/src/declarativeimports/calendar/daysmodel.h
@@ -44,7 +44,7 @@ public:
         yearNumber
     };
 
-    explicit DaysModel(QObject *parent = 0);
+    explicit DaysModel(QObject *parent = nullptr);
     virtual ~DaysModel();
     void setSourceData(QList<DayData> *data);
     int rowCount(const QModelIndex &parent) const Q_DECL_OVERRIDE;
diff --git a/src/declarativeimports/calendar/eventpluginsmanager.h b/src/declarativeimports/calendar/eventpluginsmanager.h
index 2b3b213f0..e414e1869 100644
--- a/src/declarativeimports/calendar/eventpluginsmanager.h
+++ b/src/declarativeimports/calendar/eventpluginsmanager.h
@@ -38,7 +38,7 @@ class EventPluginsManager : public QObject
     Q_PROPERTY(QStringList enabledPlugins READ enabledPlugins WRITE setEnabledPlugins NOTIFY pluginsChanged)
 
 public:
-    EventPluginsManager(QObject *parent = 0);
+    explicit EventPluginsManager(QObject *parent = nullptr);
     ~EventPluginsManager();
 
     QList<CalendarEvents::CalendarEventsPlugin*> plugins() const;
diff --git a/src/declarativeimports/core/colorscope.h b/src/declarativeimports/core/colorscope.h
index 88e6a9762..089a9c1fc 100644
--- a/src/declarativeimports/core/colorscope.h
+++ b/src/declarativeimports/core/colorscope.h
@@ -87,7 +87,7 @@ class ColorScope : public QQuickItem
 
 public:
 /// @cond INTERNAL_DOCS
-    ColorScope(QQuickItem *parent = 0, QObject *parentObject = 0);
+    explicit ColorScope(QQuickItem *parent = nullptr, QObject *parentObject = 0);
     ~ColorScope();
 
     void setColorGroup(Plasma::Theme::ColorGroup group);
diff --git a/src/declarativeimports/core/datamodel.h b/src/declarativeimports/core/datamodel.h
index 18886193f..79e7c169e 100644
--- a/src/declarativeimports/core/datamodel.h
+++ b/src/declarativeimports/core/datamodel.h
@@ -90,7 +90,7 @@ class SortFilterModel : public QSortFilterProxyModel
     friend class DataModel;
 
 public:
-    SortFilterModel(QObject *parent = 0);
+    SortFilterModel(QObject *parent = nullptr);
     ~SortFilterModel();
 
     void setModel(QAbstractItemModel *source);
@@ -182,7 +182,7 @@ class DataModel : public QAbstractItemModel
     Q_PROPERTY(int count READ count NOTIFY countChanged)
 
 public:
-    DataModel(QObject *parent = 0);
+    DataModel(QObject *parent = nullptr);
     ~DataModel();
 
     void setDataSource(QObject *source);
diff --git a/src/declarativeimports/core/datasource.h b/src/declarativeimports/core/datasource.h
index 71e0f445c..f859c5acd 100644
--- a/src/declarativeimports/core/datasource.h
+++ b/src/declarativeimports/core/datasource.h
@@ -56,7 +56,7 @@ public:
 
     typedef QMap<QString, QVariant> Data;
 
-    DataSource(QObject *parent = 0);
+    DataSource(QObject *parent = nullptr);
 
     void classBegin() Q_DECL_OVERRIDE;
     void componentComplete() Q_DECL_OVERRIDE;
@@ -124,7 +124,7 @@ public:
      * All the data fetched by this dataengine.
      * This is a map of maps. At the first level, there are the source names, at the second, they keys set by the DataEngine
      */
-    Q_PROPERTY(QQmlPropertyMap *data READ data CONSTANT);
+    Q_PROPERTY(QQmlPropertyMap *data READ data CONSTANT)
     QQmlPropertyMap *data() const
     {
         return m_data;
@@ -135,7 +135,7 @@ public:
      * In order for a model to be present, besides being implemented in the DataEngine,
      * The user has to be connected to its source, so the source name has to be present in the connectedSources property.
      */
-    Q_PROPERTY(QQmlPropertyMap *models READ models CONSTANT);
+    Q_PROPERTY(QQmlPropertyMap *models READ models CONSTANT)
     QQmlPropertyMap *models()  const
     {
         return m_models;
diff --git a/src/declarativeimports/core/framesvgitem.h b/src/declarativeimports/core/framesvgitem.h
index 82d91d583..95dcaf817 100644
--- a/src/declarativeimports/core/framesvgitem.h
+++ b/src/declarativeimports/core/framesvgitem.h
@@ -74,7 +74,7 @@ class FrameSvgItemMargins : public QObject
 
 
 public:
-    FrameSvgItemMargins(Plasma::FrameSvg *frameSvg, QObject *parent = 0);
+    FrameSvgItemMargins(Plasma::FrameSvg *frameSvg, QObject *parent = nullptr);
 
     qreal left() const;
     qreal top() const;
@@ -192,7 +192,7 @@ public:
     Q_INVOKABLE bool hasElementPrefix(const QString &prefix) const;
 
     /// @cond INTERNAL_DOCS
-    FrameSvgItem(QQuickItem *parent = 0);
+    FrameSvgItem(QQuickItem *parent = nullptr);
     ~FrameSvgItem();
 
     void setImagePath(const QString &path);
diff --git a/src/declarativeimports/core/iconitem.h b/src/declarativeimports/core/iconitem.h
index e32da0d1d..2488c320c 100644
--- a/src/declarativeimports/core/iconitem.h
+++ b/src/declarativeimports/core/iconitem.h
@@ -124,7 +124,7 @@ class IconItem : public QQuickItem
     Q_PROPERTY(int implicitWidth READ implicitWidth WRITE setImplicitWidth2 NOTIFY implicitWidthChanged2)
 
 public:
-    IconItem(QQuickItem *parent = 0);
+    explicit IconItem(QQuickItem *parent = nullptr);
     ~IconItem();
 
     void setSource(const QVariant &source);
diff --git a/src/declarativeimports/core/quicktheme.h b/src/declarativeimports/core/quicktheme.h
index e0263d89b..ec55c6f37 100644
--- a/src/declarativeimports/core/quicktheme.h
+++ b/src/declarativeimports/core/quicktheme.h
@@ -85,7 +85,7 @@ class QuickTheme : public Plasma::Theme
     Q_PROPERTY(QColor complementaryNegativeTextColor READ buttonNegativeTextColor NOTIFY themeChangedProxy)
 
 public:
-    explicit QuickTheme(QObject *parent = 0);
+    explicit QuickTheme(QObject *parent = nullptr);
     ~QuickTheme();
 
 
diff --git a/src/declarativeimports/core/serviceoperationstatus.h b/src/declarativeimports/core/serviceoperationstatus.h
index fe6af2e53..628beba3d 100644
--- a/src/declarativeimports/core/serviceoperationstatus.h
+++ b/src/declarativeimports/core/serviceoperationstatus.h
@@ -53,7 +53,7 @@ class ServiceOperationStatus : public QObject
     Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled NOTIFY enabledChanged)
 
 public:
-    ServiceOperationStatus(QObject *parent = 0);
+    explicit ServiceOperationStatus(QObject *parent = nullptr);
     ~ServiceOperationStatus();
 
     void setService(Plasma::Service *service);
diff --git a/src/declarativeimports/core/svgitem.h b/src/declarativeimports/core/svgitem.h
index f33d3501f..2e98b8945 100644
--- a/src/declarativeimports/core/svgitem.h
+++ b/src/declarativeimports/core/svgitem.h
@@ -68,7 +68,7 @@ class SvgItem : public QQuickItem
 public:
 /// @cond INTERNAL_DOCS
 
-    SvgItem(QQuickItem *parent = 0);
+    SvgItem(QQuickItem *parent = nullptr);
     ~SvgItem();
 
     void setElementId(const QString &elementID);
diff --git a/src/declarativeimports/core/tooltip.h b/src/declarativeimports/core/tooltip.h
index 2b9a48470..06593ad3d 100644
--- a/src/declarativeimports/core/tooltip.h
+++ b/src/declarativeimports/core/tooltip.h
@@ -127,7 +127,7 @@ class ToolTip : public QQuickItem
 
 public:
 /// @cond INTERNAL_DOCS
-    ToolTip(QQuickItem *parent = 0);
+    ToolTip(QQuickItem *parent = nullptr);
     ~ToolTip();
 
     QQuickItem *mainItem() const;
diff --git a/src/declarativeimports/core/tooltipdialog.h b/src/declarativeimports/core/tooltipdialog.h
index d4e0ff0a6..2652fc9ae 100644
--- a/src/declarativeimports/core/tooltipdialog.h
+++ b/src/declarativeimports/core/tooltipdialog.h
@@ -43,7 +43,7 @@ class ToolTipDialog : public PlasmaQuick::Dialog
     Q_OBJECT
 
 public:
-    ToolTipDialog(QQuickItem *parent = 0);
+    ToolTipDialog(QQuickItem *parent = nullptr);
     ~ToolTipDialog();
 
     QQuickItem *loadDefaultItem();
diff --git a/src/declarativeimports/core/units.h b/src/declarativeimports/core/units.h
index 3b8d7f1ce..e93270cc7 100644
--- a/src/declarativeimports/core/units.h
+++ b/src/declarativeimports/core/units.h
@@ -32,7 +32,7 @@ class SharedAppFilter : public QObject
 {
    Q_OBJECT
 public:
-    SharedAppFilter(QObject *parent = 0);
+    SharedAppFilter(QObject *parent = nullptr);
     ~SharedAppFilter();
 
 Q_SIGNALS:
@@ -209,7 +209,7 @@ private Q_SLOTS:
     void updateSpacing();
 
 private:
-    Units(QObject *parent = 0);
+    Units(QObject *parent = nullptr);
     Units(Units const&) = delete; // Copy construct
     Units(Units&&) = delete; // Move construct
     Units& operator=(Units const&) = delete; // Copy assign
diff --git a/src/declarativeimports/core/windowthumbnail.h b/src/declarativeimports/core/windowthumbnail.h
index 780f1d407..7f2536ff7 100644
--- a/src/declarativeimports/core/windowthumbnail.h
+++ b/src/declarativeimports/core/windowthumbnail.h
@@ -82,7 +82,7 @@ class WindowThumbnail : public QQuickItem, public QAbstractNativeEventFilter
     Q_PROPERTY(bool thumbnailAvailable READ thumbnailAvailable NOTIFY thumbnailAvailableChanged)
 
 public:
-    WindowThumbnail(QQuickItem *parent = 0);
+    WindowThumbnail(QQuickItem *parent = nullptr);
     virtual ~WindowThumbnail();
     bool nativeEventFilter(const QByteArray &eventType, void *message, long int *result) Q_DECL_OVERRIDE;
     QSGNode *updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *updatePaintNodeData) Q_DECL_OVERRIDE;
diff --git a/src/declarativeimports/plasmacomponents/fullscreensheet.h b/src/declarativeimports/plasmacomponents/fullscreensheet.h
index f1450cd28..914cf37c9 100644
--- a/src/declarativeimports/plasmacomponents/fullscreensheet.h
+++ b/src/declarativeimports/plasmacomponents/fullscreensheet.h
@@ -33,7 +33,7 @@ class FullScreenSheet : public FullScreenWindow
     Q_PROPERTY(QString rejectButtonText READ rejectButtonText WRITE setRejectButtonText NOTIFY rejectButtonTextChanged)
 
 public:
-    FullScreenSheet(QDeclarativeItem *parent = 0);
+    FullScreenSheet(QDeclarativeItem *parent = nullptr);
     ~FullScreenSheet();
 
     QString title() const;
diff --git a/src/declarativeimports/plasmacomponents/fullscreenwindow.h b/src/declarativeimports/plasmacomponents/fullscreenwindow.h
index 8632acb5a..85920bcd7 100644
--- a/src/declarativeimports/plasmacomponents/fullscreenwindow.h
+++ b/src/declarativeimports/plasmacomponents/fullscreenwindow.h
@@ -44,7 +44,7 @@ class FullScreenWindow : public QDeclarativeItem
     Q_PROPERTY(DialogStatus::Status status READ status NOTIFY statusChanged)
 
 public:
-    FullScreenWindow(QDeclarativeItem *parent = 0);
+    FullScreenWindow(QDeclarativeItem *parent = nullptr);
     ~FullScreenWindow();
 
     QGraphicsObject *mainItem() const;
diff --git a/src/declarativeimports/plasmacomponents/qmenu.h b/src/declarativeimports/plasmacomponents/qmenu.h
index 45f894dde..34e20f64f 100644
--- a/src/declarativeimports/plasmacomponents/qmenu.h
+++ b/src/declarativeimports/plasmacomponents/qmenu.h
@@ -101,7 +101,7 @@ class QMenuProxy : public QObject
     Q_PROPERTY(int maximumWidth READ maximumWidth WRITE setMaximumWidth RESET resetMaximumWidth NOTIFY maximumWidthChanged)
 
 public:
-    QMenuProxy(QObject *parent = 0);
+    explicit QMenuProxy(QObject *parent = nullptr);
     ~QMenuProxy();
 
     QQmlListProperty<QMenuItem> content();
diff --git a/src/declarativeimports/plasmacomponents/qmenuitem.h b/src/declarativeimports/plasmacomponents/qmenuitem.h
index 03a5629e6..c52ca36c2 100644
--- a/src/declarativeimports/plasmacomponents/qmenuitem.h
+++ b/src/declarativeimports/plasmacomponents/qmenuitem.h
@@ -48,7 +48,7 @@ class QMenuItem : public QQuickItem
     Q_PROPERTY(bool checked READ checked WRITE setChecked NOTIFY toggled)
 
 public:
-    QMenuItem(QQuickItem *parent = 0);
+    QMenuItem(QQuickItem *parent = nullptr);
 
     QAction *action() const;
     void setAction(QAction *a);
diff --git a/src/declarativeimports/plasmacomponents/qrangemodel.h b/src/declarativeimports/plasmacomponents/qrangemodel.h
index 1e34acf0b..1b14d3a8a 100644
--- a/src/declarativeimports/plasmacomponents/qrangemodel.h
+++ b/src/declarativeimports/plasmacomponents/qrangemodel.h
@@ -62,7 +62,7 @@ class QRangeModel : public QObject
     Q_PROPERTY(bool inverted READ inverted WRITE setInverted NOTIFY invertedChanged)
 
 public:
-    QRangeModel(QObject *parent = 0);
+    explicit QRangeModel(QObject *parent = nullptr);
     virtual ~QRangeModel();
 
     void setRange(qreal min, qreal max);
diff --git a/src/declarativeimports/plasmaextracomponents/fallbackcomponent.h b/src/declarativeimports/plasmaextracomponents/fallbackcomponent.h
index f8a9f513c..d47813e8a 100644
--- a/src/declarativeimports/plasmaextracomponents/fallbackcomponent.h
+++ b/src/declarativeimports/plasmaextracomponents/fallbackcomponent.h
@@ -48,7 +48,7 @@ class FallbackComponent : public QObject
     Q_PROPERTY(QStringList candidates READ candidates WRITE setCandidates NOTIFY candidatesChanged)
 
 public:
-    FallbackComponent(QObject *parent = 0);
+    FallbackComponent(QObject *parent = nullptr);
 
     /**
     * This method must be called after the the basePath and the candidates property
diff --git a/src/declarativeimports/platformcomponents/application.h b/src/declarativeimports/platformcomponents/application.h
index 1ec2542eb..482de8b02 100644
--- a/src/declarativeimports/platformcomponents/application.h
+++ b/src/declarativeimports/platformcomponents/application.h
@@ -52,7 +52,7 @@ class Application: public QObject
     Q_PROPERTY(bool running READ running WRITE setRunning NOTIFY runningChanged)
 
 public:
-    Application(QObject *parent = nullptr);
+    explicit Application(QObject *parent = nullptr);
     ~Application();
 
     QString application() const;
diff --git a/src/declarativeimports/platformcomponents/icondialog.h b/src/declarativeimports/platformcomponents/icondialog.h
index c3ae8cd57..0ff393e3e 100644
--- a/src/declarativeimports/platformcomponents/icondialog.h
+++ b/src/declarativeimports/platformcomponents/icondialog.h
@@ -46,7 +46,7 @@ class IconDialog: public QObject
     Q_OBJECT
 
 public:
-    IconDialog(QObject *parent = nullptr);
+    explicit IconDialog(QObject *parent = nullptr);
     ~IconDialog();
 
     Q_INVOKABLE QString openDialog();
diff --git a/src/plasma/applet.h b/src/plasma/applet.h
index 89498ea46..31f42298c 100644
--- a/src/plasma/applet.h
+++ b/src/plasma/applet.h
@@ -84,7 +84,7 @@ public:
      * @param appletId a unique id used to differentiate between multiple
      *      instances of the same Applet type
      */
-    explicit Applet(QObject *parent = 0, const QString &serviceId = QString(), uint appletId = 0);
+    explicit Applet(QObject *parent = nullptr, const QString &serviceId = QString(), uint appletId = 0);
 
     /**
      * @param parent the QObject this applet is parented to
@@ -95,7 +95,7 @@ public:
      *
      * @deprecated prefer using KPluginMetaData
      */
-    PLASMA_DEPRECATED explicit Applet(const KPluginInfo &info, QObject *parent = 0, uint appletId = 0);
+    PLASMA_DEPRECATED explicit Applet(const KPluginInfo &info, QObject *parent = nullptr, uint appletId = 0);
 
     /**
      * @param parent the QObject this applet is parented to
@@ -104,7 +104,7 @@ public:
      *      instances of the same Applet type
      * @since 5.27
      */
-    explicit Applet(const KPluginMetaData &metadata, QObject *parent = 0, uint appletId = 0);
+    explicit Applet(const KPluginMetaData &metadata, QObject *parent = nullptr, uint appletId = 0);
 
     ~Applet();
 
diff --git a/src/plasma/containment.h b/src/plasma/containment.h
index 44902d714..6680ece93 100644
--- a/src/plasma/containment.h
+++ b/src/plasma/containment.h
@@ -69,7 +69,7 @@ public:
      * @param containmentId a unique id used to differentiate between multiple
      *      instances of the same Applet type
      */
-    explicit Containment(QObject *parent = 0,
+    explicit Containment(QObject *parent = nullptr,
                          const QString &serviceId = QString(),
                          uint containmentId = 0);
 
diff --git a/src/plasma/containmentactions.h b/src/plasma/containmentactions.h
index eab617911..61a4c7b52 100644
--- a/src/plasma/containmentactions.h
+++ b/src/plasma/containmentactions.h
@@ -59,7 +59,7 @@ public:
     /**
      * Default constructor for an empty or null containmentactions
      */
-    explicit ContainmentActions(QObject *parent = 0);
+    explicit ContainmentActions(QObject *parent = nullptr);
 
     ~ContainmentActions();
 
diff --git a/src/plasma/corona.h b/src/plasma/corona.h
index ed8ecaa0e..6a5d004bd 100644
--- a/src/plasma/corona.h
+++ b/src/plasma/corona.h
@@ -46,7 +46,7 @@ class PLASMA_EXPORT Corona : public QObject
     Q_PROPERTY(KPackage::Package kPackage READ kPackage NOTIFY kPackageChanged)
 
 public:
-    explicit Corona(QObject *parent = 0);
+    explicit Corona(QObject *parent = nullptr);
     ~Corona();
 
 #ifndef PLASMA_NO_DEPRECATED
diff --git a/src/plasma/datacontainer.h b/src/plasma/datacontainer.h
index fa5807edb..10b61f402 100644
--- a/src/plasma/datacontainer.h
+++ b/src/plasma/datacontainer.h
@@ -73,7 +73,7 @@ public:
      * Constructs a default DataContainer that has no name or data
      * associated with it
      **/
-    explicit DataContainer(QObject *parent = 0);
+    explicit DataContainer(QObject *parent = nullptr);
     virtual ~DataContainer();
 
     /**
diff --git a/src/plasma/dataengine.h b/src/plasma/dataengine.h
index b91adc268..57f862ca9 100644
--- a/src/plasma/dataengine.h
+++ b/src/plasma/dataengine.h
@@ -73,9 +73,9 @@ public:
      * @param parent The parent object.
      * @param plugin plugin info that describes the engine
      **/
-    explicit DataEngine(const KPluginInfo &plugin, QObject *parent = 0);
+    explicit DataEngine(const KPluginInfo &plugin, QObject *parent = nullptr);
 
-    explicit DataEngine(QObject *parent = 0, const QVariantList &args = QVariantList());
+    explicit DataEngine(QObject *parent = nullptr, const QVariantList &args = QVariantList());
 
     ~DataEngine();
 
diff --git a/src/plasma/framesvg.h b/src/plasma/framesvg.h
index bc02cc456..4a2d80136 100644
--- a/src/plasma/framesvg.h
+++ b/src/plasma/framesvg.h
@@ -103,7 +103,7 @@ public:
      *
      * @related Plasma::Theme
      */
-    explicit FrameSvg(QObject *parent = 0);
+    explicit FrameSvg(QObject *parent = nullptr);
     ~FrameSvg();
 
     /**
diff --git a/src/plasma/packagestructure.h b/src/plasma/packagestructure.h
index 40feec60b..1afb96067 100644
--- a/src/plasma/packagestructure.h
+++ b/src/plasma/packagestructure.h
@@ -42,7 +42,7 @@ class PLASMA_EXPORT PackageStructure : public QObject
 
 public:
 
-    PLASMA_DEPRECATED explicit PackageStructure(QObject *parent = 0, const QVariantList &args = QVariantList());
+    PLASMA_DEPRECATED explicit PackageStructure(QObject *parent = nullptr, const QVariantList &args = QVariantList());
 
     ~PackageStructure();
 
diff --git a/src/plasma/packagestructure/packages_p.h b/src/plasma/packagestructure/packages_p.h
index 6863ac5aa..53ed9a44f 100644
--- a/src/plasma/packagestructure/packages_p.h
+++ b/src/plasma/packagestructure/packages_p.h
@@ -32,7 +32,7 @@ class ChangeableMainScriptPackage : public KPackage::PackageStructure
 {
     Q_OBJECT
 public:
-    ChangeableMainScriptPackage(QObject *parent = 0, const QVariantList &args = QVariantList()) : KPackage::PackageStructure(parent, args) {}
+    ChangeableMainScriptPackage(QObject *parent = nullptr, const QVariantList &args = QVariantList()) : KPackage::PackageStructure(parent, args) {}
 
     void initPackage(KPackage::Package *package) Q_DECL_OVERRIDE;
     void pathChanged(KPackage::Package *package) Q_DECL_OVERRIDE;
@@ -45,7 +45,7 @@ class GenericPackage : public ChangeableMainScriptPackage
 {
     Q_OBJECT
 public:
-    GenericPackage(QObject *parent = 0, const QVariantList &args = QVariantList()) : ChangeableMainScriptPackage(parent, args) {}
+    GenericPackage(QObject *parent = nullptr, const QVariantList &args = QVariantList()) : ChangeableMainScriptPackage(parent, args) {}
     void initPackage(KPackage::Package *package) Q_DECL_OVERRIDE;
 };
 
diff --git a/src/plasma/plasma.h b/src/plasma/plasma.h
index 3f235ddb9..5f8936d1d 100644
--- a/src/plasma/plasma.h
+++ b/src/plasma/plasma.h
@@ -285,7 +285,7 @@ public:
     Q_ENUM(BackgroundHints)
 
 private:
-    Types(QObject *parent = 0);
+    Types(QObject *parent = nullptr);
 };
 
 /**
diff --git a/src/plasma/pluginloader.h b/src/plasma/pluginloader.h
index 12f7ea8c7..886f70b8a 100644
--- a/src/plasma/pluginloader.h
+++ b/src/plasma/pluginloader.h
@@ -126,7 +126,7 @@ public:
      *
      * @return a Service object, unlike Plasma::Service::loadService, this can return null.
      **/
-    Service *loadService(const QString &name, const QVariantList &args, QObject *parent = 0);
+    Service *loadService(const QString &name, const QVariantList &args, QObject *parent = nullptr);
 
     /**
      * Load a ContainmentActions plugin.
@@ -398,7 +398,7 @@ protected:
      *
      * @return a Service object, unlike Plasma::Service::loadService, this can return null.
      **/
-    virtual Service *internalLoadService(const QString &name, const QVariantList &args, QObject *parent = 0);
+    virtual Service *internalLoadService(const QString &name, const QVariantList &args, QObject *parent = nullptr);
 
     /**
      * A re-implementable method that allows subclasses to override
diff --git a/src/plasma/private/actionwidgetinterface_p.h b/src/plasma/private/actionwidgetinterface_p.h
index 2b7fe58e4..1ef7fed30 100644
--- a/src/plasma/private/actionwidgetinterface_p.h
+++ b/src/plasma/private/actionwidgetinterface_p.h
@@ -33,13 +33,13 @@ class ActionWidgetInterface : public ThemedWidgetInterface<T>
 public:
     ActionWidgetInterface(T *parent)
         : ThemedWidgetInterface<T>(parent),
-          action(0)
+          action(nullptr)
     {
     }
 
     virtual ~ActionWidgetInterface()
     {
-        setAction(0);
+        setAction(nullptr);
     }
 
     virtual void changed()
@@ -48,7 +48,7 @@ public:
 
     void clearAction()
     {
-        action = 0;
+        action = nullptr;
         syncToAction();
         changed();
     }
@@ -92,7 +92,7 @@ public:
         }
     }
 
-    QAction *action;
+    QAction *action = nullptr;
 };
 
 } // namespace Plasma
diff --git a/src/plasma/private/associatedapplicationmanager_p.h b/src/plasma/private/associatedapplicationmanager_p.h
index 4ead085dd..16a8565c8 100644
--- a/src/plasma/private/associatedapplicationmanager_p.h
+++ b/src/plasma/private/associatedapplicationmanager_p.h
@@ -52,7 +52,7 @@ public:
     bool appletHasValidAssociatedApplication(const Plasma::Applet *applet) const;
 
 private:
-    AssociatedApplicationManager(QObject *parent = 0);
+    AssociatedApplicationManager(QObject *parent = nullptr);
     ~AssociatedApplicationManager();
 
     AssociatedApplicationManagerPrivate *const d;
diff --git a/src/plasma/private/componentinstaller_p.h b/src/plasma/private/componentinstaller_p.h
index 1902bfe16..3e30e2a19 100644
--- a/src/plasma/private/componentinstaller_p.h
+++ b/src/plasma/private/componentinstaller_p.h
@@ -74,7 +74,7 @@ public:
      * @param force whether to always prompt, even if recently prompted
      */
     void installMissingComponent(const QString &type, const QString &name,
-                                 QWidget *parent = 0, bool force = false);
+                                 QWidget *parent = nullptr, bool force = false);
 
 private:
     /**
diff --git a/src/plasma/private/containmentactions_p.h b/src/plasma/private/containmentactions_p.h
index 0c9801eb8..066041e67 100644
--- a/src/plasma/private/containmentactions_p.h
+++ b/src/plasma/private/containmentactions_p.h
@@ -32,7 +32,7 @@ public:
         package(0),
         containment(0)
     {
-    };
+    }
 
     ContainmentActions *q;
 
diff --git a/src/plasma/private/effectwatcher_p.h b/src/plasma/private/effectwatcher_p.h
index b315ac659..900bf3050 100644
--- a/src/plasma/private/effectwatcher_p.h
+++ b/src/plasma/private/effectwatcher_p.h
@@ -34,7 +34,7 @@ class EffectWatcher: public QObject, public QAbstractNativeEventFilter
     Q_OBJECT
 
 public:
-    EffectWatcher(const QString &property, QObject *parent = 0);
+    EffectWatcher(const QString &property, QObject *parent = nullptr);
 
 protected:
     bool isEffectActive() const;
diff --git a/src/plasma/private/packagestructure_p.h b/src/plasma/private/packagestructure_p.h
index 76c0f93cd..7ee95d32c 100644
--- a/src/plasma/private/packagestructure_p.h
+++ b/src/plasma/private/packagestructure_p.h
@@ -34,7 +34,7 @@ class PackageStructureWrapper : public KPackage::PackageStructure {
     Q_OBJECT
 
 public:
-    PackageStructureWrapper(Plasma::PackageStructure *structure, QObject *parent = 0, const QVariantList &args = QVariantList());
+    PackageStructureWrapper(Plasma::PackageStructure *structure, QObject *parent = nullptr, const QVariantList &args = QVariantList());
 
     ~PackageStructureWrapper();
 
diff --git a/src/plasma/private/sharedtimer_p.h b/src/plasma/private/sharedtimer_p.h
index cc5f0f70a..7ea04c229 100644
--- a/src/plasma/private/sharedtimer_p.h
+++ b/src/plasma/private/sharedtimer_p.h
@@ -41,7 +41,7 @@ protected:
 
 private:
     friend class TimerDriveSingleton;
-    explicit TimerDrive(QObject *parent = 0);
+    explicit TimerDrive(QObject *parent = nullptr);
     ~TimerDrive();
     class Private;
     Private *const d;
diff --git a/src/plasma/private/storage_p.h b/src/plasma/private/storage_p.h
index 4d2209b46..2c14d254e 100644
--- a/src/plasma/private/storage_p.h
+++ b/src/plasma/private/storage_p.h
@@ -38,7 +38,7 @@ public:
     StorageJob(const QString &destination,
                const QString &operation,
                const QVariantMap &parameters,
-               QObject *parent = 0);
+               QObject *parent = nullptr);
     ~StorageJob();
     void setData(const QVariantMap &data);
     QVariantMap data() const;
@@ -62,7 +62,7 @@ class Storage : public Plasma::Service
     Q_OBJECT
 
 public:
-    Storage(QObject *parent = 0);
+    Storage(QObject *parent = nullptr);
     ~Storage();
 
 protected:
diff --git a/src/plasma/private/storagethread_p.h b/src/plasma/private/storagethread_p.h
index d55950cb7..58b731c37 100644
--- a/src/plasma/private/storagethread_p.h
+++ b/src/plasma/private/storagethread_p.h
@@ -33,7 +33,7 @@ class StorageThread : public QThread
 {
     Q_OBJECT
 public:
-    StorageThread(QObject *parent = 0);
+    StorageThread(QObject *parent = nullptr);
     ~StorageThread();
 
     void run() Q_DECL_OVERRIDE;
diff --git a/src/plasma/private/svg_p.h b/src/plasma/private/svg_p.h
index 84b41ecfa..cbfa21250 100644
--- a/src/plasma/private/svg_p.h
+++ b/src/plasma/private/svg_p.h
@@ -37,18 +37,18 @@ class SharedSvgRenderer : public QSvgRenderer, public QSharedData
 public:
     typedef QExplicitlySharedDataPointer<SharedSvgRenderer> Ptr;
 
-    SharedSvgRenderer(QObject *parent = 0);
+    SharedSvgRenderer(QObject *parent = nullptr);
     SharedSvgRenderer(
         const QString &filename,
         const QString &styleSheet,
         QHash<QString, QRectF> &interestingElements,
-        QObject *parent = 0);
+        QObject *parent = nullptr);
 
     SharedSvgRenderer(
         const QByteArray &contents,
         const QString &styleSheet,
         QHash<QString, QRectF> &interestingElements,
-        QObject *parent = 0);
+        QObject *parent = nullptr);
 
 private:
     bool load(
diff --git a/src/plasma/private/theme_p.h b/src/plasma/private/theme_p.h
index a014ed795..94d37cce7 100644
--- a/src/plasma/private/theme_p.h
+++ b/src/plasma/private/theme_p.h
@@ -63,7 +63,7 @@ class ThemePrivate : public QObject
     Q_OBJECT
 
 public:
-    ThemePrivate(QObject *parent = 0);
+    ThemePrivate(QObject *parent = nullptr);
     ~ThemePrivate();
 
     KConfigGroup &config();
diff --git a/src/plasma/scripting/appletscript.h b/src/plasma/scripting/appletscript.h
index ada7bad42..fcd1a9155 100644
--- a/src/plasma/scripting/appletscript.h
+++ b/src/plasma/scripting/appletscript.h
@@ -57,7 +57,7 @@ public:
      * such set up that requires the Applet itself should be done
      * in the init() method.
      */
-    explicit AppletScript(QObject *parent = 0);
+    explicit AppletScript(QObject *parent = nullptr);
     ~AppletScript();
 
     /**
diff --git a/src/plasma/scripting/dataenginescript.h b/src/plasma/scripting/dataenginescript.h
index 3d15381eb..ef40a8c0b 100644
--- a/src/plasma/scripting/dataenginescript.h
+++ b/src/plasma/scripting/dataenginescript.h
@@ -49,7 +49,7 @@ public:
      * such set up that requires the DataEngine itself should be done
      * in the init() method.
      */
-    explicit DataEngineScript(QObject *parent = 0);
+    explicit DataEngineScript(QObject *parent = nullptr);
     ~DataEngineScript();
 
     /**
diff --git a/src/plasma/scripting/scriptengine.h b/src/plasma/scripting/scriptengine.h
index e1e7be85d..a54db5445 100644
--- a/src/plasma/scripting/scriptengine.h
+++ b/src/plasma/scripting/scriptengine.h
@@ -59,7 +59,7 @@ public:
     virtual bool init();
 
 protected:
-    explicit ScriptEngine(QObject *parent = 0);
+    explicit ScriptEngine(QObject *parent = nullptr);
 
     /**
      * @return absolute path to the main script file for this plasmoid
diff --git a/src/plasma/service.h b/src/plasma/service.h
index 15a65148d..60d868eb5 100644
--- a/src/plasma/service.h
+++ b/src/plasma/service.h
@@ -135,7 +135,7 @@ public:
      * @return a started ServiceJob; the consumer may connect to relevant
      *         signals before returning to the event loop
      */
-    Q_INVOKABLE ServiceJob *startOperationCall(const QVariantMap &description, QObject *parent = 0);
+    Q_INVOKABLE ServiceJob *startOperationCall(const QVariantMap &description, QObject *parent = nullptr);
 
     /**
      * Query to find if an operation is enabled or not.
@@ -167,7 +167,7 @@ protected:
      *
      * @param parent the parent object for this service
      */
-    explicit Service(QObject *parent = 0);
+    explicit Service(QObject *parent = nullptr);
 
     /**
      * Constructor for plugin loading
diff --git a/src/plasma/servicejob.h b/src/plasma/servicejob.h
index ec51695b9..7ec9e1d31 100644
--- a/src/plasma/servicejob.h
+++ b/src/plasma/servicejob.h
@@ -66,7 +66,7 @@ public:
      * @param parent      the parent object for this service
      */
     ServiceJob(const QString &destination, const QString &operation,
-               const QVariantMap &parameters, QObject *parent = 0);
+               const QVariantMap &parameters, QObject *parent = nullptr);
 
     /**
      * Destructor
diff --git a/src/plasma/svg.h b/src/plasma/svg.h
index 86ddede60..d01ab14af 100644
--- a/src/plasma/svg.h
+++ b/src/plasma/svg.h
@@ -85,7 +85,7 @@ public:
      *
      * @related Plasma::Theme
      */
-    explicit Svg(QObject *parent = 0);
+    explicit Svg(QObject *parent = nullptr);
     ~Svg();
 
     /**
diff --git a/src/plasma/theme.h b/src/plasma/theme.h
index a1416bd42..705c7d84c 100644
--- a/src/plasma/theme.h
+++ b/src/plasma/theme.h
@@ -93,7 +93,7 @@ public:
      * Default constructor. It will be the global theme configured in plasmarc
      * @param parent the parent object
      */
-    explicit Theme(QObject *parent = 0);
+    explicit Theme(QObject *parent = nullptr);
 
     /**
      * Construct a theme. It will be a custom theme instance of themeName.
@@ -101,7 +101,7 @@ public:
      * @param parent the parent object
      * @since 4.3
      */
-    explicit Theme(const QString &themeName, QObject *parent = 0);
+    explicit Theme(const QString &themeName, QObject *parent = nullptr);
 
     ~Theme();
 
diff --git a/src/plasmaquick/appletquickitem.h b/src/plasmaquick/appletquickitem.h
index d545bc964..62cd47a75 100644
--- a/src/plasmaquick/appletquickitem.h
+++ b/src/plasmaquick/appletquickitem.h
@@ -93,7 +93,7 @@ class PLASMAQUICK_EXPORT AppletQuickItem : public QQuickItem
     Q_PROPERTY(QObject *rootItem READ rootItem CONSTANT)
 
 public:
-    AppletQuickItem(Plasma::Applet *applet, QQuickItem *parent = 0);
+    AppletQuickItem(Plasma::Applet *applet, QQuickItem *parent = nullptr);
     ~AppletQuickItem();
 
 ////API NOT SUPPOSED TO BE USED BY QML
diff --git a/src/plasmaquick/configmodel.h b/src/plasmaquick/configmodel.h
index ba2bb44db..4faff4568 100644
--- a/src/plasmaquick/configmodel.h
+++ b/src/plasmaquick/configmodel.h
@@ -73,7 +73,7 @@ public:
         VisibleRole,
         KCMRole
     };
-    ConfigModel(QObject *parent = 0);
+    ConfigModel(QObject *parent = nullptr);
     ~ConfigModel();
 
     /**
diff --git a/src/plasmaquick/configview.h b/src/plasmaquick/configview.h
index af5ee9520..7b97f4023 100644
--- a/src/plasmaquick/configview.h
+++ b/src/plasmaquick/configview.h
@@ -58,7 +58,7 @@ public:
      * @param applet the applet of this ConfigView
      * @param parent the QWindow in which this ConfigView is parented to
      **/
-    ConfigView(Plasma::Applet *applet, QWindow *parent = 0);
+    ConfigView(Plasma::Applet *applet, QWindow *parent = nullptr);
     virtual ~ConfigView();
 
     virtual void init();
diff --git a/src/plasmaquick/containmentview.h b/src/plasmaquick/containmentview.h
index 4bdc1dee3..f890b3808 100644
--- a/src/plasmaquick/containmentview.h
+++ b/src/plasmaquick/containmentview.h
@@ -53,7 +53,7 @@ public:
      * @param corona the corona of this view
      * @param parent the QWindow this ContainmentView is parented to
      **/
-    explicit ContainmentView(Plasma::Corona *corona, QWindow *parent = 0);
+    explicit ContainmentView(Plasma::Corona *corona, QWindow *parent = nullptr);
     virtual ~ContainmentView();
 
     /**
diff --git a/src/plasmaquick/dialog.h b/src/plasmaquick/dialog.h
index 5299712d4..9894dffb1 100644
--- a/src/plasmaquick/dialog.h
+++ b/src/plasmaquick/dialog.h
@@ -167,7 +167,7 @@ public:
     };
     Q_ENUM(BackgroundHints)
 
-    Dialog(QQuickItem *parent = 0);
+    Dialog(QQuickItem *parent = nullptr);
     ~Dialog();
 
     //PROPERTIES ACCESSORS
diff --git a/src/plasmaquick/dialogshadows_p.h b/src/plasmaquick/dialogshadows_p.h
index 5d55776f8..c75c0bb24 100644
--- a/src/plasmaquick/dialogshadows_p.h
+++ b/src/plasmaquick/dialogshadows_p.h
@@ -37,7 +37,7 @@ class DialogShadows : public Plasma::Svg
     Q_OBJECT
 
 public:
-    explicit DialogShadows(QObject *parent = 0, const QString &prefix = QStringLiteral("dialogs/background"));
+    explicit DialogShadows(QObject *parent = nullptr, const QString &prefix = QStringLiteral("dialogs/background"));
     ~DialogShadows();
 
     static DialogShadows *self();
diff --git a/src/plasmaquick/private/configcategory_p.h b/src/plasmaquick/private/configcategory_p.h
index a5c01fa59..53f5e9602 100644
--- a/src/plasmaquick/private/configcategory_p.h
+++ b/src/plasmaquick/private/configcategory_p.h
@@ -49,7 +49,7 @@ class ConfigCategory : public QObject
     Q_PROPERTY(bool visible READ visible WRITE setVisible NOTIFY visibleChanged)
 
 public:
-    ConfigCategory(QObject *parent = 0);
+    ConfigCategory(QObject *parent = nullptr);
     ~ConfigCategory();
 
     QString name() const;
diff --git a/src/plasmaquick/view.h b/src/plasmaquick/view.h
index e60ca87d5..b1538a326 100644
--- a/src/plasmaquick/view.h
+++ b/src/plasmaquick/view.h
@@ -56,7 +56,7 @@ public:
      * @param corona the corona of this view
      * @param parent the QWindow this View is parented to
      **/
-    PLASMA_DEPRECATED explicit View(Plasma::Corona *corona, QWindow *parent = 0);
+    PLASMA_DEPRECATED explicit View(Plasma::Corona *corona, QWindow *parent = nullptr);
     PLASMA_DEPRECATED virtual ~View();
 
     /**
diff --git a/src/scriptengines/qml/plasmoid/appletinterface.h b/src/scriptengines/qml/plasmoid/appletinterface.h
index e905fb35a..0a247acab 100644
--- a/src/scriptengines/qml/plasmoid/appletinterface.h
+++ b/src/scriptengines/qml/plasmoid/appletinterface.h
@@ -239,7 +239,7 @@ class AppletInterface : public PlasmaQuick::AppletQuickItem
     Q_PROPERTY(QVariantList availableScreenRegion READ availableScreenRegion NOTIFY availableScreenRegionChanged)
 
 public:
-    AppletInterface(DeclarativeAppletScript *script, const QVariantList &args = QVariantList(), QQuickItem *parent = 0);
+    AppletInterface(DeclarativeAppletScript *script, const QVariantList &args = QVariantList(), QQuickItem *parent = nullptr);
     ~AppletInterface();
 
 //API not intended for the QML part
diff --git a/src/scriptengines/qml/plasmoid/wallpaperinterface.h b/src/scriptengines/qml/plasmoid/wallpaperinterface.h
index af40ef74c..30f1fe911 100644
--- a/src/scriptengines/qml/plasmoid/wallpaperinterface.h
+++ b/src/scriptengines/qml/plasmoid/wallpaperinterface.h
@@ -51,7 +51,7 @@ class WallpaperInterface : public QQuickItem
     Q_PROPERTY(KDeclarative::ConfigPropertyMap *configuration READ configuration NOTIFY configurationChanged)
 
 public:
-    WallpaperInterface(ContainmentInterface *parent = 0);
+    WallpaperInterface(ContainmentInterface *parent = nullptr);
     ~WallpaperInterface();
 
     /**