diff --git a/lib/builder/webpack/vue-loader.config.js b/lib/builder/webpack/vue-loader.config.js
index d8f3a1171c..0b08bc108e 100644
--- a/lib/builder/webpack/vue-loader.config.js
+++ b/lib/builder/webpack/vue-loader.config.js
@@ -15,7 +15,7 @@ export default function ({ isClient }) {
       'js': 'babel-loader?' + babelOptions,
       'css': styleLoader.call(this, 'css'),
       'less': styleLoader.call(this, 'less', 'less-loader'),
-      'sass': styleLoader.call(this, 'sass', 'sass-loader?indentedSyntax&?sourceMap'),
+      'sass': styleLoader.call(this, 'sass', 'sass-loader?indentedSyntax&sourceMap'),
       'scss': styleLoader.call(this, 'sass', 'sass-loader?sourceMap'),
       'stylus': styleLoader.call(this, 'stylus', 'stylus-loader'),
       'styl': styleLoader.call(this, 'stylus', 'stylus-loader')