diff --git a/htdocs/accountancy/supplier/lines.php b/htdocs/accountancy/supplier/lines.php
index 11b6df35c2e..a55c15952dc 100644
--- a/htdocs/accountancy/supplier/lines.php
+++ b/htdocs/accountancy/supplier/lines.php
@@ -28,6 +28,7 @@ require '../../main.inc.php';
 
 require_once DOL_DOCUMENT_ROOT . '/core/class/html.formaccounting.class.php';
 require_once DOL_DOCUMENT_ROOT . '/fourn/class/fournisseur.facture.class.php';
+require_once DOL_DOCUMENT_ROOT . '/fourn/class/fournisseur.product.class.php';
 require_once DOL_DOCUMENT_ROOT . '/product/class/product.class.php';
 require_once DOL_DOCUMENT_ROOT . '/core/lib/date.lib.php';
 require_once DOL_DOCUMENT_ROOT . '/core/lib/accounting.lib.php';