--- a/mbpanelmgr.c
+++ b/mbpanelmgr.c
@@ -505,7 +505,7 @@ window_filter (GdkXEvent *xev, GdkEvent
     {
       if (ev->xproperty.atom == atoms[_NET_CLIENT_LIST])
 	{
-	  gui_populate (dpy);
+	  gui_populate ();
 	}
 
     }