diff --git a/Services/LDAP/classes/class.ilLDAPRoleAssignmentRules.php b/Services/LDAP/classes/class.ilLDAPRoleAssignmentRules.php
index 6ee7e0a34a20..faa3d09fbbb6 100644
--- a/Services/LDAP/classes/class.ilLDAPRoleAssignmentRules.php
+++ b/Services/LDAP/classes/class.ilLDAPRoleAssignmentRules.php
@@ -100,7 +100,7 @@ public static function getAssignmentsForUpdate(int $a_server_id, $a_usr_id, $a_u
         $res = $ilDB->query($query);
         $roles = [];
         while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
-            $rule = ilLDAPRoleAssignmentRule::_getInstanceByRuleId($row->rule_id);
+            $rule = ilLDAPRoleAssignmentRule::_getInstanceByRuleId((int) $row->rule_id);
 
             $matches = $rule->matches($a_usr_data);
             if ($matches && $row->add_on_update) {