diff --git a/lib/loaders/sass.js b/lib/loaders/sass.js
index 9f9858b2..ab4c510f 100644
--- a/lib/loaders/sass.js
+++ b/lib/loaders/sass.js
@@ -42,6 +42,8 @@ module.exports = {
         const config = Object.assign({}, {
             // needed by the resolve-url-loader
             sourceMap: (true === webpackConfig.sassOptions.resolveUrlLoader) || webpackConfig.useSourceMaps
+            // CSS minification is handled with mini-css-extract-plugin
+            outputStyle: 'expanded'
         });
 
         sassLoaders.push({