diff --git a/addons/point_of_sale/static/src/js/models.js b/addons/point_of_sale/static/src/js/models.js
index b7b36d05b4e..606ee1e78c0 100644
--- a/addons/point_of_sale/static/src/js/models.js
+++ b/addons/point_of_sale/static/src/js/models.js
@@ -494,7 +494,7 @@ function openerp_pos_models(instance, module){ //module is instance.point_of_sal
         get_all_prices: function(){
             var self = this;
             var currency_rounding = this.pos.get('currency').rounding;
-            var base = round_pr(this.get_quantity() * this.get_unit_price() * (1.0 - (this.get_discount() / 100.0)), currency_rounding);
+            var base = round_pr(round_pr(this.get_quantity() * this.get_unit_price(), currency_rounding) * (1.0 - (this.get_discount() / 100.0)), currency_rounding);
             var totalTax = base;
             var totalNoTax = base;