diff --git a/examples/bundle-webpack/webpack.config.js b/examples/bundle-webpack/webpack.config.js
index c1cdd90d5..ca6675c54 100644
--- a/examples/bundle-webpack/webpack.config.js
+++ b/examples/bundle-webpack/webpack.config.js
@@ -1,3 +1,5 @@
+'use strict'
+
 var path = require('path')
 var webpack = require('webpack')