Index: modules/user/user.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.module,v
retrieving revision 1.1117
diff -u -p -r1.1117 user.module
--- modules/user/user.module	5 Feb 2010 21:07:56 -0000	1.1117
+++ modules/user/user.module	6 Feb 2010 15:50:18 -0000
@@ -2602,12 +2602,12 @@ function user_role_change_permissions($r
 function user_role_grant_permissions($rid, array $permissions = array()) {
   $modules = user_permission_get_modules();
   // Grant new permissions for the role.
-  foreach ($permissions as $name) {
+  foreach ($permissions as $permission => $module) {
     db_merge('role_permission')
       ->key(array(
         'rid' => $rid,
-        'permission' => $name,
-        'module' => $modules[$name],
+        'permission' => $permission,
+        'module' => $module,
       ))
       ->execute();
   }