diff --git a/htdocs/fourn/class/fournisseur.commande.class.php b/htdocs/fourn/class/fournisseur.commande.class.php
index 3d6d2c2f837..f354b89186d 100644
--- a/htdocs/fourn/class/fournisseur.commande.class.php
+++ b/htdocs/fourn/class/fournisseur.commande.class.php
@@ -1554,7 +1554,7 @@ class CommandeFournisseur extends CommonOrder
 			include_once DOL_DOCUMENT_ROOT.'/core/lib/price.lib.php';
 
 			// Clean parameters
-			if (!$qty) $qty = 1;
+			if (empty($qty)) $qty = 0;
 			if (!$info_bits) $info_bits = 0;
 			if (empty($txtva)) $txtva = 0;
 			if (empty($txlocaltax1)) $txlocaltax1 = 0;
@@ -2526,7 +2526,6 @@ class CommandeFournisseur extends CommonOrder
 
 			$remise_percent = price2num($remise_percent);
 			$qty = price2num($qty);
-			if (!$qty) $qty = 1;
 			$pu = price2num($pu);
 			$pu_ht_devise = price2num($pu_ht_devise);
 			$txtva = price2num($txtva);
diff --git a/htdocs/fourn/commande/card.php b/htdocs/fourn/commande/card.php
index 419d5c7a559..7cbe020142f 100644
--- a/htdocs/fourn/commande/card.php
+++ b/htdocs/fourn/commande/card.php
@@ -406,7 +406,7 @@ if (empty($reshook))
 			setEventMessages($langs->trans('ErrorFieldRequired', $langs->transnoentitiesnoconv('Description')), null, 'errors');
 			$error++;
 		}
-		if (!GETPOST('qty'))
+		if (GETPOST('qty', 'int') == '')
 		{
 			setEventMessages($langs->trans('ErrorFieldRequired', $langs->transnoentitiesnoconv('Qty')), null, 'errors');
 			$error++;
@@ -666,7 +666,7 @@ if (empty($reshook))
 		$productsupplier = new ProductFournisseur($db);
 		if (!empty($conf->global->SUPPLIER_ORDER_WITH_PREDEFINED_PRICES_ONLY))
 		{
-			if ($line->fk_product > 0 && $productsupplier->get_buyprice(0, price2num($_POST['qty']), $line->fk_product, 'none', GETPOST('socid', 'int')) < 0)
+			if ($line->fk_product > 0 && $productsupplier->get_buyprice(0, price2num(GETPOST('qty', 'int')), $line->fk_product, 'none', GETPOST('socid', 'int')) < 0)
 			{
 				setEventMessages($langs->trans("ErrorQtyTooLowForThisSupplier"), null, 'warnings');
 			}
@@ -719,7 +719,7 @@ if (empty($reshook))
 			$lineid,
 			$_POST['product_desc'],
 			$ht,
-			$_POST['qty'],
+			GETPOST('qty', 'int'),
 			$_POST['remise_percent'],
 			$vat_rate,
 			$localtax1_rate,