diff --git a/mozilla/xpcom/appshell/eventloop/windows/nsIWinEventFilter.idl b/mozilla/xpcom/appshell/eventloop/windows/nsIWinEventFilter.idl
index 3335e2e6395..4fbdf0a018f 100644
--- a/mozilla/xpcom/appshell/eventloop/windows/nsIWinEventFilter.idl
+++ b/mozilla/xpcom/appshell/eventloop/windows/nsIWinEventFilter.idl
@@ -9,8 +9,8 @@
 [scriptable, uuid(2EFB5006-4508-11d3-AEDA-00A024FFC08C)]
 interface nsIWinEventFilter : nsIEventFilter
 {
-	attribute voidStar hwnd;
+	[noscript] attribute voidStar hwnd;
 	attribute unsigned long MsgFilterMin;
 	attribute unsigned long MsgFilterMax;
 	attribute unsigned long RemoveFlags;
-};
\ No newline at end of file
+};