diff --git a/addons/point_of_sale/static/src/js/models.js b/addons/point_of_sale/static/src/js/models.js
index 204d029fa56..1858f991656 100644
--- a/addons/point_of_sale/static/src/js/models.js
+++ b/addons/point_of_sale/static/src/js/models.js
@@ -1930,7 +1930,7 @@ exports.Orderline = Backbone.Model.extend({
     },
     // sets a discount [0,100]%
     set_discount: function(discount){
-        var parsed_discount = isNaN(parseFloat(discount)) ? 0 : field_utils.parse.float('' + discount);
+        var parsed_discount = typeof(discount) === 'number' ? discount : isNaN(parseFloat(discount)) ? 0 : field_utils.parse.float('' + discount);
         var disc = Math.min(Math.max(parsed_discount || 0, 0),100);
         this.discount = disc;
         this.discountStr = '' + disc;