diff --git a/lib/parser.js b/lib/parser.js
index 192382d3..08935917 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -1,7 +1,7 @@
 // Generated by CoffeeScript 1.12.7
 (function() {
   "use strict";
-  var bom, defaults, events, isEmpty, processItem, processors, sax, setImmediate,
+  var bom, defaults, events, isEmpty, isValidKey, processItem, processors, sax, setImmediate,
     bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; },
     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; },
     hasProp = {}.hasOwnProperty;
@@ -22,6 +22,10 @@
     return typeof thing === "object" && (thing != null) && Object.keys(thing).length === 0;
   };
 
+  isValidKey = function(key) {
+    return key !== '__proto__' && key !== 'constructor' && key !== 'prototype';
+  };
+
   processItem = function(processors, item, key) {
     var i, len, process;
     for (i = 0, len = processors.length; i < len; i++) {
@@ -92,6 +96,9 @@
     };
 
     Parser.prototype.assignOrPush = function(obj, key, newValue) {
+      if (!isValidKey(key)) {
+        return;
+      }
       if (!(key in obj)) {
         if (!this.options.explicitArray) {
           return obj[key] = newValue;
@@ -141,21 +148,23 @@
       this.saxParser.onopentag = (function(_this) {
         return function(node) {
           var key, newValue, obj, processedKey, ref;
-          obj = Object.create(null);
+          obj = {};
           obj[charkey] = "";
           if (!_this.options.ignoreAttrs) {
             ref = node.attributes;
             for (key in ref) {
               if (!hasProp.call(ref, key)) continue;
               if (!(attrkey in obj) && !_this.options.mergeAttrs) {
-                obj[attrkey] = Object.create(null);
+                obj[attrkey] = {};
               }
               newValue = _this.options.attrValueProcessors ? processItem(_this.options.attrValueProcessors, node.attributes[key], key) : node.attributes[key];
               processedKey = _this.options.attrNameProcessors ? processItem(_this.options.attrNameProcessors, key) : key;
-              if (_this.options.mergeAttrs) {
-                _this.assignOrPush(obj, processedKey, newValue);
-              } else {
-                obj[attrkey][processedKey] = newValue;
+              if (isValidKey(processedKey)) {
+                if (_this.options.mergeAttrs) {
+                  _this.assignOrPush(obj, processedKey, newValue);
+                } else {
+                  obj[attrkey][processedKey] = newValue;
+                }
               }
             }
           }
@@ -226,7 +235,7 @@
           }
           if (_this.options.explicitChildren && !_this.options.mergeAttrs && typeof obj === 'object') {
             if (!_this.options.preserveChildrenOrder) {
-              node = Object.create(null);
+              node = {};
               if (_this.options.attrkey in obj) {
                 node[_this.options.attrkey] = obj[_this.options.attrkey];
                 delete obj[_this.options.attrkey];
@@ -241,10 +250,12 @@
               obj = node;
             } else if (s) {
               s[_this.options.childkey] = s[_this.options.childkey] || [];
-              objClone = Object.create(null);
+              objClone = {};
               for (key in obj) {
                 if (!hasProp.call(obj, key)) continue;
-                objClone[key] = obj[key];
+                if (isValidKey(key)) {
+                  objClone[key] = obj[key];
+                }
               }
               s[_this.options.childkey].push(objClone);
               delete obj["#name"];
@@ -258,7 +269,7 @@
           } else {
             if (_this.options.explicitRoot) {
               old = obj;
-              obj = Object.create(null);
+              obj = {};
               obj[nodeName] = old;
             }
             _this.resultObject = obj;