diff --git a/application/modules/auth/models/UserModel.php b/application/modules/auth/models/UserModel.php
index a5a14443275d4a3a981d0a6d82017665d50d751a..f45389f662ecebe8505cea8ca8f83b280a9e8354 100644
--- a/application/modules/auth/models/UserModel.php
+++ b/application/modules/auth/models/UserModel.php
@@ -126,7 +126,7 @@ class Auth_UserModel extends Unl_Model {
             }
             $select->where('parentGroup IN(?)', $group->getId());
         } else {
-            $select->where('parentGroup = ?', $group->getId());
+            $select->where($db->quoteInto('parentGroup = ?', $group->getId()));
         }
         
         $records = $select->query()->fetchAll();