--- admin_menu.inc	2010-07-09 18:11:00.000000000 +0200
+++ admin_menu.inc	2010-07-09 18:13:00.000000000 +0200
@@ -32,7 +32,7 @@ function _admin_menu_rebuild_links() {
   // Allow modules to add more links. If you want to alter links saved by
   // admin_menu, use hook_menu_link_alter() and look for
   // $item['module'] == 'admin_menu'
-  $links = module_invoke_all('admin_menu', $deleted);
+  $links = module_invoke_all('admin_menu', &$deleted);
   foreach ($links as $item) {
     admin_menu_link_save($item);
   }