diff --git xmlsitemap_menu/xmlsitemap_menu.module xmlsitemap_menu/xmlsitemap_menu.module
index 7200b32..275061d 100644
--- xmlsitemap_menu/xmlsitemap_menu.module
+++ xmlsitemap_menu/xmlsitemap_menu.module
@@ -171,7 +171,7 @@ function xmlsitemap_menu_menu_link_update(array $link) {
  * @see http://drupal.org/node/1013856
  */
 function xmlsitemap_menu_menu_link_alter(array &$link) {
-  if (!empty($link['mlid'])) {
+  if (!empty($link['mlid']) && ($link['module'] != 'system' || !empty($link['customized'])) {
     $link += array('xmlsitemap' => array());
     xmlsitemap_menu_xmlsitemap_process_menu_links(array($link['mlid']), $link['xmlsitemap']);
   }