diff --git a/UI/WebServerResources/UIxMailUserDelegationEditor.js b/UI/WebServerResources/UIxMailUserDelegationEditor.js
index f47754684..b7dedefad 100644
--- a/UI/WebServerResources/UIxMailUserDelegationEditor.js
+++ b/UI/WebServerResources/UIxMailUserDelegationEditor.js
@@ -104,8 +104,6 @@ function onDelegationLoadHandler() {
         $("addDelegate").observe("mousedown", onDelegateAdd);
         $("deleteDelegate").observe("mousedown", onDelegateRemove);
     }
-
-    Event.observe(window, "unload", onDelegationCloseHandler);
 }
 
 document.observe("dom:loaded", onDelegationLoadHandler);