diff --git a/index.js b/index.js
index 21dcf0f..61846ec 100644
--- a/index.js
+++ b/index.js
@@ -89,7 +89,7 @@ module.exports = {
 
     if (this.flagValue('input-transform') !== false) {
       const transform = require('./transforms/input');
-      .registry.add('htmlbars-ast-plugin', {
+      this.app.registry.add('htmlbars-ast-plugin', {
         name: 'transform-input-on-to-onEvent',
         plugin: transform
       });