--- a/mail/base/content/mailOverlay.xul
+++ b/mail/base/content/mailOverlay.xul
@@ -22,17 +22,17 @@
         if ("MsgNewMessage" in window)
         {
           MsgNewMessage(null);
           return;
         }
 
         var msgComposeService = Components.classes["@mozilla.org/messengercompose;1"].getService();
         msgComposeService = msgComposeService.QueryInterface(Components.interfaces.nsIMsgComposeService);
-        msgComposeService.OpenComposeWindow(null, null, null
+        msgComposeService.OpenComposeWindow(null, null, null,
                                             Components.interfaces.nsIMsgCompType.New,
                                             Components.interfaces.nsIMsgCompFormat.Default,
                                             null, null);
       }
 
   ]]>
   </script>