diff --git a/dist/subtotal.js b/dist/subtotal.js
index d4cdc99..68080bc 100644
--- a/dist/subtotal.js
+++ b/dist/subtotal.js
@@ -1,6 +1,18 @@
 (function() {
   var callWithJQuery,
-    extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
+    extend = function(child, parent) {
+      for (var key in parent) {
+        if (hasProp.call(parent, key)) 
+          child[key] = parent[key]; 
+      } 
+      function ctor() { 
+        this.constructor = child; 
+      } 
+      child.prototype = parent.prototype; 
+      ctor.prototype = child.prototype; 
+      child.__super__ = parent.prototype; 
+      return child; 
+    },
     hasProp = {}.hasOwnProperty,
     slice = [].slice;