diff --git a/lib/builder/builder.js b/lib/builder/builder.js
index 1fcb834c59..751a8a7e7b 100644
--- a/lib/builder/builder.js
+++ b/lib/builder/builder.js
@@ -389,7 +389,7 @@ export default class Builder extends Tapable {
       ignoreInitial: true
     })
     /* istanbul ignore next */
-    const refreshFiles = _.debounce(this.generateRoutesAndFiles, 200)
+    const refreshFiles = _.debounce(() => this.generateRoutesAndFiles(), 200)
 
     // Watch for src Files
     let filesWatcher = chokidar.watch(patterns, options)