diff --git a/index.js b/index.js
index 44920958..aa3f1295 100644
--- a/index.js
+++ b/index.js
@@ -1,9 +1,10 @@
 'use strict';
+const path = require('path');
 
 module.exports = {
   name: require('./package').name,
 
   included(app) {
-    app.import('vendor/polyfills/closest.js', { prepend: true})
+    app.import(path.join(this.treePaths.vendor, 'polyfills', 'closest.js'), { prepend: true})
   }
 };