diff --git a/xpfe/appshell/public/nsIXULWindow.idl b/xpfe/appshell/public/nsIXULWindow.idl
index ebec94bac85..c44841cfc3f 100644
--- a/xpfe/appshell/public/nsIXULWindow.idl
+++ b/xpfe/appshell/public/nsIXULWindow.idl
@@ -51,7 +51,7 @@ interface nsIDocShellTreeItem;
 interface nsIAppShell;
 interface nsIXULBrowserWindow;
 
-[scriptable, uuid(b6c2f9e1-53a0-45f2-a2b8-fe37861fe8a8)]
+[scriptable, uuid(c175a596-ee13-420a-aa74-13ad3a14deb1)]
 interface nsIXULWindow : nsISupports
 {
   /**