diff --git a/addons/website_event_track_online/controllers/event_track.py b/addons/website_event_track_online/controllers/event_track.py
index 26727aea53e..8df8b5deb5c 100644
--- a/addons/website_event_track_online/controllers/event_track.py
+++ b/addons/website_event_track_online/controllers/event_track.py
@@ -8,6 +8,7 @@ from datetime import timedelta
 import pytz
 
 from odoo import exceptions, http, fields
+from odoo.addons.http_routing.models.ir_http import url_for
 from odoo.addons.website_event_track.controllers.main import WebsiteEventTrackController
 from odoo.http import request
 from odoo.modules.module import get_module_resource
@@ -243,8 +244,8 @@ class EventTrackOnlineController(WebsiteEventTrackController):
             'name': _('%s Online Events') % company.name,
             'short_name': company.name,
             'description': _('%s Online Events') % company.name,
-            'scope': '/event',
-            'start_url': '/event',
+            'scope': url_for('/event'),
+            'start_url': url_for('/event'),
             'display': 'standalone',
             'background_color': '#ffffff',
             'theme_color': '#875A7B',
@@ -270,6 +271,6 @@ class EventTrackOnlineController(WebsiteEventTrackController):
             body = fp.read()
         response = request.make_response(body, [
             ('Content-Type', 'text/javascript'),
-            ('Service-Worker-Allowed', '/event'),
+            ('Service-Worker-Allowed', url_for('/event')),
         ])
         return response
diff --git a/addons/website_event_track_online/static/src/js/website_event_pwa_widget.js b/addons/website_event_track_online/static/src/js/website_event_pwa_widget.js
index f8fffb3f9b1..15770c023dd 100644
--- a/addons/website_event_track_online/static/src/js/website_event_pwa_widget.js
+++ b/addons/website_event_track_online/static/src/js/website_event_pwa_widget.js
@@ -3,6 +3,7 @@ odoo.define("website_event_track_online.website_event_pwa_widget", function (req
 
     var config = require("web.config");
     var publicWidget = require("web.public.widget");
+    var utils = require("web.utils");
 
     var PWAInstallBanner = publicWidget.Widget.extend({
         xmlDependencies: ["/website_event_track_online/static/src/xml/website_event_pwa.xml"],
@@ -41,7 +42,7 @@ odoo.define("website_event_track_online.website_event_pwa_widget", function (req
         start: function () {
             var superProm = this._super.apply(this, arguments);
             window.addEventListener("beforeinstallprompt", this.beforeInstallPromptHandler);
-            return superProm.then(this._registerServiceWorker);
+            return superProm.then(this._registerServiceWorker.bind(this));
         },
 
         /**
@@ -57,6 +58,19 @@ odoo.define("website_event_track_online.website_event_pwa_widget", function (req
         // Private
         //--------------------------------------------------------------------------
 
+        /**
+         * Returns the website's language
+         * @private
+         * @return {String}
+         */
+        _getLangPrefix: function () {
+            var lang = utils.get_cookie('frontend_lang');
+            if (lang !== undefined && window.location.href.indexOf(`/${lang}/`) >= 0) {
+                return `/${lang}`;
+            }
+            return '';
+        },
+
         /**
          * @private
          */
@@ -72,8 +86,9 @@ odoo.define("website_event_track_online.website_event_pwa_widget", function (req
             if (!("serviceWorker" in navigator)) {
                 return;
             }
+            var langPrefix = this._getLangPrefix();
             navigator.serviceWorker
-                .register("/event/service-worker.js", { scope: "/event" })
+                .register(`${langPrefix}/event/service-worker.js`, { scope: `${langPrefix}/event` })
                 .then((registration) => {
                     console.info("Registration successful, scope is:", registration.scope);
                 })