diff --git a/package.json b/package.json
index cf94332..d4644c7 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,7 @@
   "dependencies": {
     "async": "^2.0.0",
     "loader-utils": "^1.1.0",
+    "lodash.clone": "^4.5.0",
     "source-map": "^0.5.6",
     "webpack-dev-middleware": "^3.2.0"
   },
diff --git a/src/karma-webpack.js b/src/karma-webpack.js
index aa3b403..dfdc472 100644
--- a/src/karma-webpack.js
+++ b/src/karma-webpack.js
@@ -7,9 +7,7 @@
 const os = require('os');
 const path = require('path');
 
-function clone(obj) {
-  return Object.assign({}, obj);
-}
+const clone = require('lodash.clone')
 const async = require('async');
 const webpack = require('webpack');
 const WebpackDevMiddleware = require('webpack-dev-middleware');