diff --git a/GUI/View/Mask/SizeHandleElement.h b/GUI/View/Mask/SizeHandleElement.h
index e811fac2bcd82a6591b7fb789df2da2cb64b1107..34f7f873e35752b6dc16238a7f3258c1f90aebb0 100644
--- a/GUI/View/Mask/SizeHandleElement.h
+++ b/GUI/View/Mask/SizeHandleElement.h
@@ -24,7 +24,7 @@
 //! Placed either in corners on in the middle of the edge.
 
 class SizeHandleElement : public QGraphicsObject {
-    Q_OBJECT
+    Q_OBJECT // needed by qobject_cast
 
 public:
     int type() const override { return MaskEditorHelper::SIZEHANDLE; }