diff --git a/webpack.config.js b/webpack.config.js
index 47b36f8fb8..8f02f3ce8a 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -27,8 +27,7 @@ module.exports = function(env, options) {
       getAotPlugin('client', !!env.aot)
     ]
   });
-
-  if (options.mode === 'production') {
+  if (env.production) {
     serverConfig = webpackMerge({}, serverConfig, prodPartial);
     clientConfig = webpackMerge({}, clientConfig, prodPartial);
   }
diff --git a/webpack/webpack.prod.js b/webpack/webpack.prod.js
index 30b279aa50..9b15b464e3 100644
--- a/webpack/webpack.prod.js
+++ b/webpack/webpack.prod.js
@@ -42,7 +42,7 @@ module.exports = {
 
     ],
     optimization: {
-        minimize: [
+        minimizer: [
             new UglifyJsPlugin({
                 uglifyOptions: {
                     beautify: false,