diff --git a/Gruntfile.js b/Gruntfile.js
index a508944a8d..c61ba147b5 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -4,14 +4,14 @@ module.exports = function (grunt) {
     sass: {
       dev: {
         options: {
-          style: 'expanded',
-          sourcemap: true,
           includePaths: [
             'govuk_modules/govuk_template/assets/stylesheets',
             'govuk_modules/govuk_frontend_toolkit/stylesheets',
             'govuk_modules/govuk-elements-sass/'
           ],
-          outputStyle: 'expanded'
+          outputStyle: 'expanded',
+          sourceComments: true,
+          sourceMap: true
         },
         files: [{
           expand: true,