diff --git a/lib/module.js b/lib/module.js
index c4d7384..b8d2e37 100644
--- a/lib/module.js
+++ b/lib/module.js
@@ -29,6 +29,7 @@ module.exports = function (moduleOptions) {
     '.eslintrc.js'
   ]
 
+  this.options.watch = this.options.watch || []
   this.options.watch.push(
     ...filesToWatch.map(file => resolve(this.options.rootDir, file))
   )