diff --git a/demo/config/webpack.dev.js b/demo/config/webpack.dev.js
index ccdece6a..0fffdeb6 100644
--- a/demo/config/webpack.dev.js
+++ b/demo/config/webpack.dev.js
@@ -6,6 +6,9 @@ const common = require("./webpack.common.js");
 module.exports = merge(common, {
   devtool: "source-map",
   mode: "development",
+  devServer: {
+    overlay: true,
+  },
   plugins: [
     new webpack.DefinePlugin({
       SENTRY_DSN: JSON.stringify(