diff --git a/src/includes/class/class.LSformElement_supannEtuInscription.php b/src/includes/class/class.LSformElement_supannEtuInscription.php
index 70eef6c4..17ad7284 100644
--- a/src/includes/class/class.LSformElement_supannEtuInscription.php
+++ b/src/includes/class/class.LSformElement_supannEtuInscription.php
@@ -81,7 +81,7 @@ class LSformElement_supannEtuInscription extends LSformElement_supannCompositeAt
         'check_data' => array (
           'regex' => array (
             'params' => array (
-              'regex' => '/^[LMDXB][0-9]?$/'
+              'regex' => '/^\{SUPANN\}[LMDXB][0-9]?$/'
             ),
           ),
         ),