diff --git a/lam/pwa_worker.js b/lam/pwa_worker.js
new file mode 100644
index 00000000..2127b8ae
--- /dev/null
+++ b/lam/pwa_worker.js
@@ -0,0 +1,48 @@
+/**
+
+  This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
+  Copyright (C) 2019  Roland Gruber
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+*/
+
+const CACHE = "lam";
+
+self.addEventListener("install", function (event) {
+  event.waitUntil(
+    caches.open(CACHE).then(function (cache) {
+      console.log("LAM PWA installed");
+      return true;
+    })
+  );
+});
+
+self.addEventListener("fetch", function (event) {
+	if (event.request.method !== "GET") {
+		return;
+	}
+	event.respondWith(
+		fetch(event.request).catch(function (error) {
+			if (event.request.destination !== "document" ||
+					event.request.mode !== "navigate") {
+				return;
+				}
+			console.error("Network request failed: " + error);
+			return;
+		})
+	);
+});
+
diff --git a/lam/templates/lib/500_lam.js b/lam/templates/lib/500_lam.js
index daad80d6..df857cd1 100644
--- a/lam/templates/lib/500_lam.js
+++ b/lam/templates/lib/500_lam.js
@@ -1174,3 +1174,17 @@ jQuery(document).ready(function() {
 	window.lam.html.activateLightboxes();
 	window.lam.html.preventEnter();
 });
+
+/**
+ * Setup service worker
+ */
+if ("serviceWorker" in navigator) {
+	if (!navigator.serviceWorker.controller) {
+		var basePath = document.currentScript.src;
+		basePath = basePath.replace(/\/[^/]+\.js/gi, '');
+		var workerJS = basePath + '/../../pwa_worker.js';
+		navigator.serviceWorker.register(workerJS, {
+			scope : basePath + "../../"
+		});
+	}
+}