diff --git a/app.js b/app.js
index b0aceba..66d6d5f 100644
--- a/app.js
+++ b/app.js
@@ -1116,4 +1116,5 @@ class DienstplanApp {
 let app;
 document.addEventListener('DOMContentLoaded', () => {
     app = new DienstplanApp();
+    window.app = app;
 });