diff --git a/htdocs/fourn/class/fournisseur.facture.class.php b/htdocs/fourn/class/fournisseur.facture.class.php
index 41ac2f126a7..132fcbc9e47 100644
--- a/htdocs/fourn/class/fournisseur.facture.class.php
+++ b/htdocs/fourn/class/fournisseur.facture.class.php
@@ -36,6 +36,7 @@
 
 include_once DOL_DOCUMENT_ROOT.'/core/class/commoninvoice.class.php';
 require_once DOL_DOCUMENT_ROOT.'/multicurrency/class/multicurrency.class.php';
+require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
 
 /**
  *	Class to manage suppliers invoices