diff --git a/kcmkwin/kwincompositing/model.h b/kcmkwin/kwincompositing/model.h
index 8bba11d589..57cc939118 100644
--- a/kcmkwin/kwincompositing/model.h
+++ b/kcmkwin/kwincompositing/model.h
@@ -63,12 +63,12 @@ public:
 
     explicit EffectModel(QObject *parent = 0);
 
-    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
-    QModelIndex parent(const QModelIndex &child) const;
-    int rowCount(const QModelIndex &parent = QModelIndex()) const;
-    int columnCount(const QModelIndex &parent = QModelIndex()) const;
-    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
-    bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole);
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
+    QModelIndex parent(const QModelIndex &child) const override;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+    bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole) override;
     QString serviceName(const QString &effectName);
     bool effectListContains(const QString &effectFilter, int source_row);