diff -u b/modules/help/help.admin.inc b/modules/help/help.admin.inc
--- b/modules/help/help.admin.inc
+++ b/modules/help/help.admin.inc
@@ -47,7 +47,7 @@
     }
   }
   else {
-    drupal_not_found();
+    return MENU_NOT_FOUND;
   }
   return $output;
 }