diff --git a/addons/pos_discount/static/src/js/discount.js b/addons/pos_discount/static/src/js/discount.js
index 87b97f88e16..fc41e55bc05 100644
--- a/addons/pos_discount/static/src/js/discount.js
+++ b/addons/pos_discount/static/src/js/discount.js
@@ -42,10 +42,16 @@ var DiscountButton = screens.ActionButtonWidget.extend({
         }
 
         // Add discount
+        // We add the price as manually set to avoid recomputation when changing customer.
         var discount = - pc / 100.0 * order.get_total_with_tax();
 
         if( discount < 0 ){
-            order.add_product(product, { price: discount });
+            order.add_product(product, {
+                price: discount,
+                extras: {
+                    price_manually_set: true,
+                },
+            });
         }
     },
 });