diff --git a/js/ui/workspaces.js b/js/ui/workspaces.js
index 2a63a1183..c79af1770 100644
--- a/js/ui/workspaces.js
+++ b/js/ui/workspaces.js
@@ -599,6 +599,9 @@ Workspace.prototype = {
                                         }));
             return;
         }
+        
+        if (!this._isOverlayWindow(win))
+            return;        
 
         let clone = this._addWindowClone(win);