diff --git a/application/models/person/Benutzer_model.php b/application/models/person/Benutzer_model.php
index 91bf77b00..eff1329a6 100644
--- a/application/models/person/Benutzer_model.php
+++ b/application/models/person/Benutzer_model.php
@@ -9,7 +9,7 @@ class Benutzer_model extends DB_Model
 	{
 		parent::__construct();
 		$this->dbTable = 'public.tbl_benutzer';
-		$this->pk = 'uid';
+		$this->pk = array('uid');
 		$this->hasSequence = false;
 	}