diff --git a/widgets/toolbutton.h b/widgets/toolbutton.h
index 3c891f9b2..89bbbb060 100644
--- a/widgets/toolbutton.h
+++ b/widgets/toolbutton.h
@@ -186,7 +186,7 @@ protected:
     QVariant itemChange(GraphicsItemChange change, const QVariant &value); 
     QSizeF sizeHint(Qt::SizeHint which, const QSizeF & constraint) const;
 
-private slots:
+private Q_SLOTS:
     void setAnimationUpdate(qreal progress);
     qreal animationUpdate() const;