diff --git a/htdocs/product/stats/facture.php b/htdocs/product/stats/facture.php
index f8aa4fa7ac0..00f9c84338e 100644
--- a/htdocs/product/stats/facture.php
+++ b/htdocs/product/stats/facture.php
@@ -235,7 +235,7 @@ if ($id > 0 || ! empty($ref))
 					{
                         $objp = $db->fetch_object($result);
                         
-						if ($objp->type == '2') $objp->qty=-($objp->qty);
+						if ($objp->type == Facture::TYPE_CREDIT_NOTE) $objp->qty=-($objp->qty);
                         $total_ht+=$objp->total_ht;
                         $total_qty+=$objp->qty;