diff --git a/bureau/class/functions.php b/bureau/class/functions.php
index 2a603e40..bce820e6 100644
--- a/bureau/class/functions.php
+++ b/bureau/class/functions.php
@@ -126,7 +126,7 @@ function checkip($ip) {
 
 /* Check a login mail */
 function checkloginmail($mail) {
-  if (!preg_match("/^[a-zA-Z0-9_\.:\+\-]+$/",$mail)) {
+  if (!preg_match("/^[a-zA-Z0-9_\.:\+\-]*[a-zA-Z0-9_]$/",$mail)) {
     return false;
   } else {
     return true;