diff --git a/config/webpack.dev.js b/config/webpack.dev.js
index 8c5548e0..3ca33796 100644
--- a/config/webpack.dev.js
+++ b/config/webpack.dev.js
@@ -16,7 +16,7 @@ const LoaderOptionsPlugin = require('webpack/lib/LoaderOptionsPlugin');
  */
 const ENV = process.env.ENV = process.env.NODE_ENV = 'development';
 const HOST = process.env.HOST || 'localhost';
-const PORT = process.env.PORT || 3000;
+const PORT = Number(process.env.PORT) || 3000;
 const HMR = helpers.hasProcessFlag('hot');
 const METADATA = webpackMerge(commonConfig({env: ENV}).metadata, {
   host: HOST,