diff --git a/.travis.yml b/.travis.yml
index 67898ed7..c538763f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,10 @@
 sudo: false
 language: node_js
 node_js:
+  - "0.10"
+  - "0.12"
+  - iojs
+  - "4"
   - "stable"
 
 script: "npm run travis"
diff --git a/index.ts b/index.ts
index f5c4b2f4..eee91d17 100644
--- a/index.ts
+++ b/index.ts
@@ -2,8 +2,4 @@
 
 import { JavaScriptObfuscator } from './src/JavaScriptObfuscator';
 
-if (!(<any>global)._babelPolyfill) {
-    require('babel-polyfill');
-}
-
 module.exports = JavaScriptObfuscator;