diff --git a/addon/index.js b/addon/index.js
index ae72221..9d53afb 100644
--- a/addon/index.js
+++ b/addon/index.js
@@ -1,11 +1,11 @@
 import {
   Inflector,
-  defaultRules,
   pluralize,
   singularize
 } from "./lib/system";
 
 export default Inflector;
+const { defaultRules } = Inflector;
 
 export {
   pluralize,
diff --git a/config/ember-try.js b/config/ember-try.js
index 72e0bc7..a27b301 100644
--- a/config/ember-try.js
+++ b/config/ember-try.js
@@ -4,6 +4,7 @@ const getChannelURL = require('ember-source-channel-url');
 
 module.exports = async function() {
   return {
+    useYarn: true,
     scenarios: [
       {
         name: 'ember-lts-3.16',