diff --git a/support/webpack/config.js b/support/webpack/config.js
index 88d6ccfaa7..5646630418 100644
--- a/support/webpack/config.js
+++ b/support/webpack/config.js
@@ -6,6 +6,7 @@ const ExtractTextPlugin = require('extract-text-webpack-plugin')
 const CopyWebpackPlugin = require('copy-webpack-plugin')
 const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
 
+const DefinePlugin = webpack.DefinePlugin
 const NamedModulesPlugin = webpack.NamedModulesPlugin
 const HotModuleReplacementPlugin = webpack.HotModuleReplacementPlugin
 const IS_PROD = process.env.NODE_ENV === 'production'
@@ -57,6 +58,11 @@ const config = {
     ],
   },
   plugins: [
+    new DefinePlugin({
+      'process.env.NODE_ENV': JSON.stringify(
+        IS_PROD ? 'production' : 'development'
+      ),
+    }),
     new ExtractTextPlugin('[name]-[contenthash].css'),
     new HtmlWebpackPlugin({
       title: 'Slate',