diff --git a/src/plasma/datacontainer.h b/src/plasma/datacontainer.h
index 8a6af40a5..f30fee7ad 100644
--- a/src/plasma/datacontainer.h
+++ b/src/plasma/datacontainer.h
@@ -244,7 +244,7 @@ Q_SIGNALS:
      * @param source  the datacontainer the update was requested for.  Useful
      *                for classes that update the data for several containers.
      **/
-    void updateRequested(DataContainer *source);
+    void updateRequested(Plasma::DataContainer *source);
 
 protected:
     /**
diff --git a/src/plasma/dataengine.h b/src/plasma/dataengine.h
index cc1f42a4d..44003d835 100644
--- a/src/plasma/dataengine.h
+++ b/src/plasma/dataengine.h
@@ -93,7 +93,7 @@ public:
      *         is parented to the DataEngine, but should be deleted by the
      *         caller when finished with it
      */
-    Q_INVOKABLE virtual Service *serviceForSource(const QString &source);
+    Q_INVOKABLE virtual Plasma::Service *serviceForSource(const QString &source);
 
     /**
      * @return description of the plugin that implements this DataEngine
@@ -177,7 +177,7 @@ public:
      * @param source the name of the source.
      * @return pointer to a DataContainer, or zero on failure
      **/
-    Q_INVOKABLE DataContainer *containerForSource(const QString &source);
+    Q_INVOKABLE Plasma::DataContainer *containerForSource(const QString &source);
 
     /**
      * @return The model associated to a source if any. The ownership of the model stays with the DataContainer.
diff --git a/src/plasma/service.h b/src/plasma/service.h
index 485d23f03..b5282dc95 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 = nullptr);
+    Q_INVOKABLE Plasma::ServiceJob *startOperationCall(const QVariantMap &description, QObject *parent = nullptr);
 
     /**
      * Query to find if an operation is enabled or not.