diff --git a/config/babel.js b/config/babel.js
index 92d2a25fc..10bb88b29 100644
--- a/config/babel.js
+++ b/config/babel.js
@@ -1,6 +1,5 @@
 'use strict'
 
 module.exports = {
-  presets: [require.resolve('babel-preset-es2015')],
-  plugins: [require.resolve('babel-plugin-transform-runtime')]
+  presets: [require.resolve('babel-preset-es2015')]
 }
diff --git a/config/karma.conf.js b/config/karma.conf.js
index 6718e0169..44ec2d414 100644
--- a/config/karma.conf.js
+++ b/config/karma.conf.js
@@ -32,7 +32,7 @@ module.exports = function (config) {
     ],
     exclude: [],
     preprocessors: {
-      'test/**/*': ['webpack']
+      'test/**/*': ['webpack', 'sourcemap']
     },
     webpack: webpackConfig.dev,
     webpackMiddleware: {
diff --git a/config/webpack.js b/config/webpack.js
index c99ec3e1b..0021179a8 100644
--- a/config/webpack.js
+++ b/config/webpack.js
@@ -108,7 +108,7 @@ const shared = {
 }
 
 const dev = _.defaultsDeep({}, shared, {
-  devtool: 'source-map',
+  devtool: 'inline-source-map',
   debug: true
 }, specific)
 
diff --git a/package.json b/package.json
index 38bb7d203..591aa33e4 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,6 @@
     "args-parser": "^1.0.2",
     "babel-core": "^6.7.4",
     "babel-loader": "^6.2.4",
-    "babel-plugin-transform-runtime": "^6.6.0",
     "babel-polyfill": "^6.7.4",
     "babel-preset-es2015": "^6.6.0",
     "brfs": "^1.4.3",
@@ -58,6 +57,7 @@
     "karma-mocha": "^0.2.2",
     "karma-mocha-own-reporter": "^1.1.2",
     "karma-phantomjs-launcher": "^1.0.0",
+    "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^1.7.0",
     "lodash": "^4.8.2",
     "mocha": "^2.4.5",