diff --git a/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php b/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
index 5299bbb7a..d42f275d1 100644
--- a/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
+++ b/library/Icinga/Authentication/UserGroup/DbUserGroupBackend.php
@@ -204,7 +204,7 @@ class DbUserGroupBackend extends DbRepository implements Inspectable, UserGroupB
         $membershipQuery = $this
             ->select()
             ->from('group_membership', array('group_name'))
-            ->where('user_name', $user->getUsername());
+            ->where('user', $user->getUsername());
 
         $memberships = array();
         foreach ($membershipQuery as $membership) {