diff --git a/autotests/dialognativetest.cpp b/autotests/dialognativetest.cpp
index 6378e1e6b..b9523f288 100644
--- a/autotests/dialognativetest.cpp
+++ b/autotests/dialognativetest.cpp
@@ -95,7 +95,6 @@ void DialogNativeTest::position()
     QCOMPARE(m_dialog->x(), 0);
     QCOMPARE(m_dialog->y(), 49);
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 3, 0)
     m_dialog->setVisualParent(m_panel2->contentItem());
     QCOMPARE(m_dialog->x(), 69);
     QCOMPARE(m_dialog->y(), 49);
@@ -104,7 +103,6 @@ void DialogNativeTest::position()
     m_dialog->setVisualParent(m_content2);
     QCOMPARE(m_dialog->x(), 169);
     QCOMPARE(m_dialog->y(), 24);
-#endif
 }
 
 QTEST_MAIN(DialogNativeTest)
diff --git a/autotests/dialogstatetest.cpp b/autotests/dialogstatetest.cpp
index 333f74fa4..f8ac9bc9b 100644
--- a/autotests/dialogstatetest.cpp
+++ b/autotests/dialogstatetest.cpp
@@ -37,9 +37,6 @@ void DialogStateTest::cleanupTestCase()
 
 void DialogStateTest::windowState()
 {
-#if QT_VERSION < QT_VERSION_CHECK(5, 6, 0)
-    QSKIP("This test is broken with Qt 5.5");
-#endif
     for (int i = 0; i <= 100; ++i) {
         m_dialog->show();
 
diff --git a/src/declarativeimports/core/framesvgitem.cpp b/src/declarativeimports/core/framesvgitem.cpp
index 922b347bc..fd63e1927 100644
--- a/src/declarativeimports/core/framesvgitem.cpp
+++ b/src/declarativeimports/core/framesvgitem.cpp
@@ -122,12 +122,9 @@ public:
     void updateTexture(const QSize &size, const QString &elementId)
     {
         QQuickWindow::CreateTextureOptions options;
-//Qt < 5.3.2. has a crash on some atlas textures
-#if (QT_VERSION > QT_VERSION_CHECK(5, 3, 2))
         if (m_fitMode != Tile) {
             options = QQuickWindow::TextureCanUseAtlas;
         }
-#endif
         setTexture(s_cache->loadTexture(m_frameSvg->window(), m_frameSvg->frameSvg()->image(size, elementId), options));
     }
 
diff --git a/src/declarativeimports/core/tooltipdialog.cpp b/src/declarativeimports/core/tooltipdialog.cpp
index 04c544614..4f4c70c66 100644
--- a/src/declarativeimports/core/tooltipdialog.cpp
+++ b/src/declarativeimports/core/tooltipdialog.cpp
@@ -22,9 +22,7 @@
 #include <QQmlEngine>
 #include <QQuickItem>
 #include <QDebug>
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 5, 0))
 #include <QPlatformSurfaceEvent>
-#endif
 
 #include <kdeclarative/qmlobjectsharedengine.h>
 #include <KWindowSystem>
diff --git a/src/declarativeimports/core/windowthumbnail.cpp b/src/declarativeimports/core/windowthumbnail.cpp
index 21cdae71a..6ba6e1539 100644
--- a/src/declarativeimports/core/windowthumbnail.cpp
+++ b/src/declarativeimports/core/windowthumbnail.cpp
@@ -223,12 +223,7 @@ void WindowThumbnail::releaseResources()
     Q_ASSERT(m_glxPixmap == XCB_PIXMAP_NONE || m_image == EGL_NO_IMAGE_KHR);
 #endif
 #if HAVE_GLX || HAVE_EGL
-    // NoStage is supported since Qt >= 5.6.x
-    #if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
-        QQuickWindow::RenderStage m_renderStage = QQuickWindow::NoStage;
-    #else
-        QQuickWindow::RenderStage m_renderStage = QQuickWindow::BeforeSynchronizingStage;
-    #endif
+    QQuickWindow::RenderStage m_renderStage = QQuickWindow::NoStage;
 #endif
 
     //data is deleted in the render thread (with relevant GLX calls)
diff --git a/src/plasmaquick/configmodel.cpp b/src/plasmaquick/configmodel.cpp
index 5322ddf4a..e59be7758 100644
--- a/src/plasmaquick/configmodel.cpp
+++ b/src/plasmaquick/configmodel.cpp
@@ -272,6 +272,7 @@ QVariant ConfigModel::data(const QModelIndex &index, int role) const
             d->kcms[pluginName] = cm;
             return QVariant::fromValue(cm);
         }
+        return QVariant();
     }
     default:
         return QVariant();
diff --git a/src/plasmaquick/dialog.cpp b/src/plasmaquick/dialog.cpp
index 6d9e95092..e720c4cf9 100644
--- a/src/plasmaquick/dialog.cpp
+++ b/src/plasmaquick/dialog.cpp
@@ -34,9 +34,7 @@
 #include <QMenu>
 #include <QPointer>
 
-#if (QT_VERSION > QT_VERSION_CHECK(5, 5, 0))
 #include <QPlatformSurfaceEvent>
-#endif
 
 #include <kwindowsystem.h>
 #include <KWindowSystem/KWindowInfo>
@@ -1190,14 +1188,12 @@ bool Dialog::event(QEvent *event)
             d->updateTheme();
         }
 #endif
-#if (QT_VERSION > QT_VERSION_CHECK(5, 5, 0))
     } else if (event->type() == QEvent::PlatformSurface) {
         const QPlatformSurfaceEvent *pSEvent = static_cast<QPlatformSurfaceEvent *>(event);
 
         if (pSEvent->surfaceEventType() == QPlatformSurfaceEvent::SurfaceCreated) {
             KWindowSystem::setState(winId(), NET::SkipTaskbar | NET::SkipPager);
         }
-#endif
     } else if (event->type() == QEvent::Show) {
         d->updateVisibility(true);
     } else if (event->type() == QEvent::Hide) {