diff --git a/test/fixtures/with-config/nuxt.config.js b/test/fixtures/with-config/nuxt.config.js
index 862863d8d1..d323084807 100644
--- a/test/fixtures/with-config/nuxt.config.js
+++ b/test/fixtures/with-config/nuxt.config.js
@@ -9,5 +9,8 @@ module.exports = {
     bool: true,
     num: 23,
     string: 'Nuxt.js'
+  },
+  extend (config, options) {
+    config.devtool = 'eval-source-map'
   }
 }