diff --git a/classes/Kohana/Database/LDAP.php b/classes/Kohana/Database/LDAP.php
index 412a995..be80b64 100644
--- a/classes/Kohana/Database/LDAP.php
+++ b/classes/Kohana/Database/LDAP.php
@@ -45,7 +45,7 @@ abstract class Kohana_Database_LDAP extends Kohana_LDAP {
 	 * @override We provide the columns that are in all LDAP objects
 	 */
 	public function list_columns($table,$like=NULL,$add_prefix=TRUE) {
-		return array('dn'=>array(),'objectclass'=>array());
+		return array('dn'=>array('data_type'=>NULL),'objectclass'=>array('data_type'=>NULL));
 	}
 
 	/**