diff --git a/make-webpack-config.js b/make-webpack-config.js
index 2e81510a..0ab2f156 100644
--- a/make-webpack-config.js
+++ b/make-webpack-config.js
@@ -137,7 +137,7 @@ module.exports = function(rules, options) {
       }
     },
 
-  devtool: specialOptions.sourcemaps ? "nosource-source-map" : null,
+  devtool: specialOptions.sourcemaps ? "nosource-source-map" : false,
 
     plugins,