diff --git a/htdocs/includes/modules/commande/modules_commande.php b/htdocs/includes/modules/commande/modules_commande.php
index 54d71772c61..b348452d713 100644
--- a/htdocs/includes/modules/commande/modules_commande.php
+++ b/htdocs/includes/modules/commande/modules_commande.php
@@ -35,6 +35,7 @@
 require_once(DOL_DOCUMENT_ROOT.'/lib/functions.inc.php');
 require_once(DOL_DOCUMENT_ROOT.'/includes/fpdf/fpdfi/fpdi_protection.php');
 require_once(DOL_DOCUMENT_ROOT."/compta/bank/account.class.php");	// requis car utilise par les classes qui heritent
+require_once(DOL_DOCUMENT_ROOT.'/discount.class.php');
 
 
 /**