diff --git a/la_chariotte/order/templates/order/grouped_order_detail.html b/la_chariotte/order/templates/order/grouped_order_detail.html
index a1deb2b..726d079 100644
--- a/la_chariotte/order/templates/order/grouped_order_detail.html
+++ b/la_chariotte/order/templates/order/grouped_order_detail.html
@@ -185,13 +185,15 @@
     {% block extra_js %}
         // Compute total price whenever a value in input is modified
         document.getElementById("inputs-parent").addEventListener("change", function () {
-            var inputs = [...document.getElementsByTagName("input")].filter(input => input.getAttribute("name").indexOf("quantity_") === 0);  //filter the inputs to get the quantity inputs only
-            total_price = 0;
+            inputs = [...document.getElementsByTagName("input")].filter(input => input.getAttribute("name").indexOf("quantity_") === 0);  //filter the inputs to get the quantity inputs only
+
+            prices = {{ prices_dict | safe }};
+            let total_price = 0;
+
             for (let input of inputs) {
                 input_name = input.getAttribute("name");
                 item_id = input_name.split("_")[1];
-                prices = {{ prices_dict | safe }};
-                total_price = Number((total_price + Number((prices[item_id] * input.value).toFixed(2))).toFixed(2));  //Limit precision to 2 digits for each added part and for the total
+                total_price = Number((total_price + (prices[item_id] * input.value)).toFixed(2));  //Limit precision to 2 digits for each added part and for the total
             }
 
             [].forEach.call(document.getElementsByClassName('total'), function (el) {