diff --git a/test/dev/dev-compile-performance.ts b/test/dev/dev-compile-performance.ts
index 9b75f874..c87cfb10 100644
--- a/test/dev/dev-compile-performance.ts
+++ b/test/dev/dev-compile-performance.ts
@@ -2,10 +2,6 @@
 
 import * as fs from 'fs';
 
-if (!(<any>global)._babelPolyfill) {
-    require('babel-polyfill');
-}
-
 (function () {
     const JavaScriptObfuscator: any = require("../../index");
 
diff --git a/test/dev/dev-runtime-performance.ts b/test/dev/dev-runtime-performance.ts
index 271b9c5b..dbd45639 100644
--- a/test/dev/dev-runtime-performance.ts
+++ b/test/dev/dev-runtime-performance.ts
@@ -1,9 +1,5 @@
 'use strict';
 
-if (!(<any>global)._babelPolyfill) {
-    require('babel-polyfill');
-}
-
 (function () {
     const JavaScriptObfuscator: any = require("../../index");
 
diff --git a/test/dev/dev.ts b/test/dev/dev.ts
index 5307d3d8..e44e814c 100644
--- a/test/dev/dev.ts
+++ b/test/dev/dev.ts
@@ -1,9 +1,5 @@
 'use strict';
 
-if (!(<any>global)._babelPolyfill) {
-    require('babel-polyfill');
-}
-
 (function () {
     const JavaScriptObfuscator: any = require("../../index");