diff --git a/karma.conf.js b/karma.conf.js
index 4ef657b..0b1c903 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -5,6 +5,7 @@ module.exports = function(config) {
     basePath: '',
     browsers: [ 'PhantomJS' ],
     files: [
+      'node_modules/babel-polyfill/dist/polyfill.js',
       'test/loadtests.js'
     ],
     port: 8080,
diff --git a/package.json b/package.json
index dc71508..82e087f 100644
--- a/package.json
+++ b/package.json
@@ -39,6 +39,7 @@
     "babel-core": "^6.0.0",
     "babel-eslint": "^5.0.0-beta4",
     "babel-loader": "^6.0.0",
+    "babel-polyfill": "^6.3.14",
     "babel-preset-es2015": "^6.0.15",
     "babel-preset-react": "^6.0.15",
     "bower-webpack-plugin": "^0.1.9",