diff --git a/lib/loaders/sass.js b/lib/loaders/sass.js
index 9f9858b2..d6b5acba 100644
--- a/lib/loaders/sass.js
+++ b/lib/loaders/sass.js
@@ -32,7 +32,8 @@ module.exports = {
                 loader: 'resolve-url-loader',
                 options: Object.assign(
                     {
-                        sourceMap: webpackConfig.useSourceMaps
+                        sourceMap: webpackConfig.useSourceMaps,
+                        outputStyle: 'nested'
                     },
                     webpackConfig.sassOptions.resolveUrlLoaderOptions
                 )