diff --git a/lib/core/renderer.js b/lib/core/renderer.js
index 7bf6cc3c3c..31cd8f3087 100644
--- a/lib/core/renderer.js
+++ b/lib/core/renderer.js
@@ -107,7 +107,7 @@ export default class Renderer extends Tapable {
     return this
   }
 
-  async loadResources (_fs) {
+  async loadResources (_fs = fs) {
     let distPath = resolve(this.options.buildDir, 'dist')
 
     let updated = []