diff --git a/htdocs/includes/modules/societe/mod_codeclient_zebre.php b/htdocs/includes/modules/societe/mod_codeclient_zebre.php
index 77c68c12e09..2767da61773 100644
--- a/htdocs/includes/modules/societe/mod_codeclient_zebre.php
+++ b/htdocs/includes/modules/societe/mod_codeclient_zebre.php
@@ -51,7 +51,7 @@ class mod_codeclient_zebre
    *
    */
 
-  function verif($db, $code, $socid=0)
+  function verif($db, &$code, $socid=0)
     { 
       $code = strtoupper(trim($code));
 
diff --git a/htdocs/societe.class.php b/htdocs/societe.class.php
index dd924fe13be..297c868b761 100644
--- a/htdocs/societe.class.php
+++ b/htdocs/societe.class.php
@@ -1030,7 +1030,7 @@ class Societe {
 
 	$mod = new $var;
 
-	return $mod->verif($this->db, &$this->code_client);
+	return $mod->verif($this->db, $this->code_client);
       }
     else
       {