diff --git a/service-worker.js b/service-worker.js
index 3649d09..33d3d88 100644
--- a/service-worker.js
+++ b/service-worker.js
@@ -16,7 +16,7 @@ Copyright 2015, 2019, 2020 Google LLC. All Rights Reserved.
 const OFFLINE_VERSION = 1;
 const CACHE_NAME = "offline";
 // Customize this with a different URL if needed.
-const OFFLINE_URL = document.location.href;
+const OFFLINE_URL = "index.php";
 
 self.addEventListener("install", (event) => {
   event.waitUntil(