diff --git a/library/Icinga/Repository/LdapRepository.php b/library/Icinga/Repository/LdapRepository.php
index 15594d269..7cf00ae66 100644
--- a/library/Icinga/Repository/LdapRepository.php
+++ b/library/Icinga/Repository/LdapRepository.php
@@ -29,6 +29,7 @@ abstract class LdapRepository extends Repository
      */
     protected $normedAttributes = array(
         'uid'               => 'uid',
+        'gid'               => 'gid',
         'user'              => 'user',
         'group'             => 'group',
         'member'            => 'member',