diff --git a/tools/webpack.dev.config.js b/tools/webpack.dev.config.js
index 143750b1b7..03ceb4c827 100644
--- a/tools/webpack.dev.config.js
+++ b/tools/webpack.dev.config.js
@@ -19,6 +19,9 @@ config.plugins.push(new webpack.HotModuleReplacementPlugin());
 // Better logging from console for hot reload
 config.plugins.push(new webpack.NamedModulesPlugin());
 
+// script-loader should load sourceURL in dev
+config.plugins.push(new webpack.LoaderOptionsPlugin({debug: true}));
+
 config.devServer = {
     clientLogLevel: "warning",
     hot: true,