diff --git a/js/ui/workspace.js b/js/ui/workspace.js
index 7ffec352b..92f9622f2 100644
--- a/js/ui/workspace.js
+++ b/js/ui/workspace.js
@@ -421,7 +421,7 @@ var WindowClone = GObject.registerClass({
     }
 
     acceptDrop(source, actor, x, y, time) {
-        this._workspace.acceptDrop(source, actor, x, y, time);
+        return this._workspace.acceptDrop(source, actor, x, y, time);
     }
 
     _onDragCancelled(_draggable, _time) {