diff --git a/webpack.config.js b/webpack.config.js
index 68b45f66..d21e4865 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,3 +1,5 @@
+'use strict';
+
 const path = require('path');
 const webpack = require('webpack');
 const {optimize} = webpack;