diff --git a/htdocs/includes/modules/societe/mod_codeclient_zebre.php b/htdocs/includes/modules/societe/mod_codeclient_zebre.php
index 2767da61773..817ccd293c9 100644
--- a/htdocs/includes/modules/societe/mod_codeclient_zebre.php
+++ b/htdocs/includes/modules/societe/mod_codeclient_zebre.php
@@ -147,7 +147,7 @@ class mod_codeclient_zebre
   }
 
 
-  function verif_syntax($code)
+  function verif_syntax(&$code)
   {
     $res = 0;