diff --git a/libs/canvas/canvas/item.h b/libs/canvas/canvas/item.h
index 4c0366b859..c7f8a0e043 100644
--- a/libs/canvas/canvas/item.h
+++ b/libs/canvas/canvas/item.h
@@ -200,7 +200,7 @@ public:
 	void raise_child_to_top (Item *);
 	void raise_child (Item *, int);
 	void lower_child_to_bottom (Item *);
-	void child_changed ();
+	virtual void child_changed ();
 
 	static int default_items_per_cell;