diff --git a/classes/datalayer/mysql/MySQLUserDAO.php b/classes/datalayer/mysql/MySQLUserDAO.php
index 8d2ba8783af603b8d3a7384f619378d13e2e9cb1..3b9768e15836311414492888defd7375cd8ab48d 100644
--- a/classes/datalayer/mysql/MySQLUserDAO.php
+++ b/classes/datalayer/mysql/MySQLUserDAO.php
@@ -206,7 +206,7 @@ class MySQLUserDAO extends BaseMySQLDAO implements UserDAO {
 
         $stmt = $dbh->prepare($query);
 
-        foreach ($identifiers as $id) {
+        foreach ($identifiers as &$id) {
             $stmt->bindParam(':id_' . $id, $id);
         }
 
@@ -234,7 +234,7 @@ class MySQLUserDAO extends BaseMySQLDAO implements UserDAO {
 
             array_push($user->identities, $identity);
         }
-
+        
         $users = [];
         foreach ($userMap as $userId => $user) {
             array_push($users, $user);