diff --git a/web/index.html b/web/index.html
index 7e0c91368..2d25b2f1a 100644
--- a/web/index.html
+++ b/web/index.html
@@ -60,6 +60,8 @@
     if ('serviceWorker' in navigator) {
       // Service workers are supported. Use them.
       window.addEventListener('load', function () {
+        navigator.serviceWorker.register('/firebase-messaging-sw.js');
+
         // Wait for registration to finish before dropping the <script> tag.
         // Otherwise, the browser will load the script multiple times,
         // potentially different versions.