diff --git a/library/Icinga/Authentication/UserGroup/LdapUserGroupBackend.php b/library/Icinga/Authentication/UserGroup/LdapUserGroupBackend.php
index e0e957ee3..fab3d6bea 100644
--- a/library/Icinga/Authentication/UserGroup/LdapUserGroupBackend.php
+++ b/library/Icinga/Authentication/UserGroup/LdapUserGroupBackend.php
@@ -434,7 +434,7 @@ class LdapUserGroupBackend extends LdapRepository implements UserGroupBackendInt
     protected function initializeFilterColumns()
     {
         return array(
-            t('Username')       => 'user',
+            t('Username')       => 'user_name',
             t('User Group')     => 'group_name',
             t('Created At')     => 'created_at',
             t('Last Modified')  => 'last_modified'