diff --git a/htdocs/fourn/class/fournisseur.commande.class.php b/htdocs/fourn/class/fournisseur.commande.class.php
index d2511d2125c..4cd851bc08e 100644
--- a/htdocs/fourn/class/fournisseur.commande.class.php
+++ b/htdocs/fourn/class/fournisseur.commande.class.php
@@ -1703,7 +1703,7 @@ class CommandeFournisseur extends CommonOrder
             $this->error='ErrorBadValueForParameterWarehouse';
             return -1;
         }
-        if ($qty <= 0)
+        if ($qty == 0)
         {
             $this->error='ErrorBadValueForParameterQty';
             return -1;