diff --git a/inc/drivers_ldap.php b/inc/drivers_ldap.php
index 51e023d5..73110d62 100644
--- a/inc/drivers_ldap.php
+++ b/inc/drivers_ldap.php
@@ -696,6 +696,8 @@ function sync_LDAP(){
   $users_to_deactivate = array_diff($db_users,$ldap_users);
   // users present in ldap and in the db
   $users_to_update = array_intersect($db_users,$ldap_users);
+  // users not modified
+  $users_nothing_done = array();
 
   // creation of all users;
   if ( sizeof($users_to_create) ) {