diff --git a/karma.conf.js b/karma.conf.js
index 92e390c..9375315 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -22,8 +22,7 @@ module.exports = function (config) {
 
         // list of files / patterns to load in the browser
         files: [
-            'node_modules/bignumber.js/bignumber.js',
-            'test/*.js',
+            'test/*.js'
         ],
 
 
diff --git a/lib/solidity/formatters.js b/lib/solidity/formatters.js
index 11b3160..3f6766b 100644
--- a/lib/solidity/formatters.js
+++ b/lib/solidity/formatters.js
@@ -20,10 +20,7 @@
  * @date 2015
  */
 
-if (process.env.NODE_ENV !== 'build') {
-    var BigNumber = require('bignumber.js'); // jshint ignore:line
-}
-
+var BigNumber = require('bignumber.js');
 var utils = require('../utils/utils');
 var c = require('../utils/config');
 
diff --git a/lib/utils/browser-xhr.js b/lib/utils/browser-xhr.js
new file mode 100644
index 0000000..4c92000
--- /dev/null
+++ b/lib/utils/browser-xhr.js
@@ -0,0 +1,3 @@
+'use strict';
+
+exports.XMLHttpRequest = window.XMLHttpRequest;
diff --git a/lib/utils/config.js b/lib/utils/config.js
index f5b1068..8a1d473 100644
--- a/lib/utils/config.js
+++ b/lib/utils/config.js
@@ -34,9 +34,7 @@
  */
 
 /// required to define ETH_BIGNUMBER_ROUNDING_MODE
-if (process.env.NODE_ENV !== 'build') {
-    var BigNumber = require('bignumber.js'); // jshint ignore:line
-}
+var BigNumber = require('bignumber.js');
 
 var ETH_UNITS = [ 
     'wei', 
diff --git a/lib/utils/utils.js b/lib/utils/utils.js
index 680ea9b..28da8d1 100644
--- a/lib/utils/utils.js
+++ b/lib/utils/utils.js
@@ -33,9 +33,7 @@
  * @constructor
  */
 
-if (process.env.NODE_ENV !== 'build') {
-    var BigNumber = require('bignumber.js'); // jshint ignore:line
-}
+var BigNumber = require('bignumber.js');
 
 var unitMap = {
     'wei':      '1',
diff --git a/lib/web3/httpprovider.js b/lib/web3/httpprovider.js
index 8e1daa5..00828e1 100644
--- a/lib/web3/httpprovider.js
+++ b/lib/web3/httpprovider.js
@@ -22,9 +22,7 @@
  * @date 2014
  */
 
-if (process.env.NODE_ENV !== 'build') {
-        var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore:line
-}
+var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest; // jshint ignore:line
 
 var HttpProvider = function (host) {
     this.name  = 'HTTP';
diff --git a/package.json b/package.json
index 258eb5d..6ea7322 100644
--- a/package.json
+++ b/package.json
@@ -9,10 +9,11 @@
   },
   "dependencies": {
     "bignumber.js": ">=2.0.0",
-    "envify": "^3.0.0",
-    "unreachable-branch-transform": "^0.1.0",
     "xmlhttprequest": "*"
   },
+  "browser": {
+    "xmlhttprequest": "./lib/utils/browser-xhr.js"
+  },
   "devDependencies": {
     "bower": ">=1.3.0",
     "browserify": ">=6.0",
@@ -53,19 +54,6 @@
   "bugs": {
     "url": "https://github.com/ethereum/ethereum.js/issues"
   },
-  "browserify": {
-    "transform": [
-      [
-        "envify",
-        {
-          "NODE_ENV": "build"
-        }
-      ],
-      [
-        "unreachable-branch-transform"
-      ]
-    ]
-  },
   "keywords": [
     "ethereum",
     "javascript",