diff --git a/media/js/discipline/editStructure.js b/media/js/discipline/editStructure.js
index 387f7a0992603479e33fee5981fc39b2458371ee..4a41aa5e9f81fb35f99c0752c1d72f51d72853b0 100644
--- a/media/js/discipline/editStructure.js
+++ b/media/js/discipline/editStructure.js
@@ -19,7 +19,7 @@ $(document).ready(function () {
         sum: function (asText) {
             var sum = 0;
             this.each(function () {
-                sum += parseInt(0 + asText ? $(this).text() : $(this).val())
+                sum += parseInt(0 + ( asText ? $(this).text() : $(this).val() ))
             });
             return sum;
         },