diff --git a/addons/website_sale/models/sale_order.py b/addons/website_sale/models/sale_order.py
index fda4a7fcc38..f806ab8bb57 100644
--- a/addons/website_sale/models/sale_order.py
+++ b/addons/website_sale/models/sale_order.py
@@ -152,12 +152,12 @@ class SaleOrder(models.Model):
 
         try:
             if add_qty:
-                add_qty = float(add_qty)
+                add_qty = int(add_qty)
         except ValueError:
             add_qty = 1
         try:
             if set_qty:
-                set_qty = float(set_qty)
+                set_qty = int(set_qty)
         except ValueError:
             set_qty = 0
         quantity = 0