diff --git a/tests/ts-app-template/app/app.ts b/tests/ts-app-template/app/app.ts
index df50bd33b..dc71d8aac 100644
--- a/tests/ts-app-template/app/app.ts
+++ b/tests/ts-app-template/app/app.ts
@@ -1,11 +1,9 @@
 import Application from '@ember/application';
-// @ts-ignore
 import compatModules from '@embroider/core/entrypoint';
 import Resolver from 'ember-resolver';
 import loadInitializers from 'ember-load-initializers';
 import config from 'ts-app-template/config/environment';
 
-// @ts-ignore
 let d = window.define;
 
 for (const [name, module] of Object.entries(compatModules)) {
diff --git a/tests/ts-app-template/types/global.d.ts b/tests/ts-app-template/types/global.d.ts
index 2c531e29a..84a68b049 100644
--- a/tests/ts-app-template/types/global.d.ts
+++ b/tests/ts-app-template/types/global.d.ts
@@ -1 +1,7 @@
 import '@glint/environment-ember-loose';
+
+declare global {
+  interface Window {
+    define: any;
+  }
+}