diff --git a/js/Features.js b/js/Features.js
index 3337865b..a45357da 100644
--- a/js/Features.js
+++ b/js/Features.js
@@ -152,17 +152,17 @@ Features.prototype.updateData = function (featureElement) {
             var group = featureElement.attr('name');
             var controlElements = $('input[name="' + group + '"]');
             var selectedBit = controlElements.filter(':checked').val();
-            var thisFeature = this;
+            var featureMask = this._featureMask;
             controlElements.each(function() {
                 var bit = $(this).val();
                 if (selectedBit === bit) {
-                	thisFeature._featureMask = bit_set(thisFeature._featureMask, bit);
+                	featureMask = bit_set(featureMask, bit);
                 } else {
-                	thisFeature._featureMask = bit_clear(thisFeature._featureMask, bit);
+                	featureMask = bit_clear(featureMask, bit);
                 }
 
             });
-
+            this._featureMask = featureMask;
             break;
     }
 }