diff --git a/blueprints/ember-cli-typescript/index.js b/blueprints/ember-cli-typescript/index.js
index <HASH>..<HASH> 100644
--- a/blueprints/ember-cli-typescript/index.js
+++ b/blueprints/ember-cli-typescript/index.js
@@ -32,7 +32,8 @@ module.exports = {
     return this.addPackagesToProject([
       { name: 'typescript', target: '^2.1' },
       { name: '@types/ember', target: '^2.7.41' },
-      { name: '@types/rsvp', target: '^3.3.0' }
+      { name: '@types/rsvp', target: '^3.3.0' },
+      { name: '@types/ember-testing-helpers' },
     ]);
   }
 }
Add @types/ember-testing-helpers to `afterInstall`.