diff --git a/htdocs/contrat/ligne.php b/htdocs/contrat/ligne.php
index f7993c1fdfe..d5ff338b0ad 100644
--- a/htdocs/contrat/ligne.php
+++ b/htdocs/contrat/ligne.php
@@ -37,6 +37,7 @@ if ($conf->contrat->enabled) require_once(DOL_DOCUMENT_ROOT."/contrat/contrat.cl
 $langs->load("contracts");
 $langs->load("orders");
 $langs->load("companies");
+$langs->load("bills");
 
 $user->getrights('contrat');