diff --git a/adventskalender/2025/index.html b/adventskalender/2025/index.html
index e3b485f..b04461d 100644
--- a/adventskalender/2025/index.html
+++ b/adventskalender/2025/index.html
@@ -104,6 +104,7 @@
 <script src="../shared/js/glitter.js"></script>
 <script src="../shared/js/save-progress.js"></script>
 <script src="../shared/js/lock.js"></script>
+<script src="js/background.js"></script>
 <script src="js/popup.js"></script>
 <script src="../shared/js/door-open.js"></script>
 </body>