Index: system.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.admin.inc,v
retrieving revision 1.158
diff -u -p -r1.158 system.admin.inc
--- system.admin.inc	19 Jun 2009 20:35:05 -0000	1.158
+++ system.admin.inc	3 Jul 2009 18:29:31 -0000
@@ -928,6 +928,7 @@ function system_modules_submit($form, &$
 
   $current_module_list = module_list(TRUE);
   if ($old_module_list != $current_module_list) {
+    menu_rebuild();
     drupal_set_message(t('The configuration options have been saved.'));
   }