diff --git a/htdocs/commande/card.php b/htdocs/commande/card.php
index 8030df6b75dfc..5c193f426f3f2 100644
--- a/htdocs/commande/card.php
+++ b/htdocs/commande/card.php
@@ -986,7 +986,7 @@
 			$localtax2_tx = get_localtax($tva_tx, 2, $object->thirdparty);
 
 			// Margin
-			$fournprice = price2num(GETPOST('fournprice'.$predef) ? GETPOST('fournprice'.$predef) : '');
+			$fournprice = price2num(GETPOST('fournprice_predef') ? GETPOST('fournprice_predef') : '');
 			$buyingprice = price2num(GETPOST('buying_price'.$predef) != '' ? GETPOST('buying_price'.$predef) : ''); // If buying_price is '0', we muste keep this value
 
 			// Prepare a price equivalent for minimum price check
diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index bb96c2c2f815a..1f8e04f2a2d05 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -2326,7 +2326,7 @@
 			 */
 
 			// Margin
-			$fournprice = price2num(GETPOST('fournprice'.$predef) ? GETPOST('fournprice'.$predef) : '');
+			$fournprice = price2num(GETPOST('fournprice_predef') ? GETPOST('fournprice_predef') : '');
 			$buyingprice = price2num(GETPOST('buying_price'.$predef) != '' ? GETPOST('buying_price'.$predef) : ''); // If buying_price is '0', we must keep this value