diff --git a/package.json b/package.json
index 9a406fffbe..e8ba5b4262 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   "scripts": {
     "setup_js_dev": "git submodule init && git submodule update && cd home-assistant-js && npm install",
     "clean": "rm -rf build/* build-temp/*",
-    "js_dev": "script/sw-precache.js && npm run watch_ru_all",
+    "js_dev": "script/gen-service-worker.js && npm run watch_ru_all",
     "js_dev_demo": "BUILD_DEMO=1 npm run watch_ru_all",
     "js_prod": "BUILD_DEV=0 npm run ru_all",
     "js_demo": "BUILD_DEV=0 BUILD_DEMO=1 npm run ru_all",
diff --git a/script/sw-precache.js b/script/gen-service-worker.js
similarity index 66%
rename from script/sw-precache.js
rename to script/gen-service-worker.js
index ce85f898d3..f8af981265 100755
--- a/script/sw-precache.js
+++ b/script/gen-service-worker.js
@@ -56,7 +56,7 @@ panelsFingerprinted.forEach(panel => {
   dynamicUrlToDependencies[url] = [fpath];
 });
 
-const options = {
+var options = {
   navigateFallback: '/',
   navigateFallbackWhitelist: [/^((?!(static|api|local|service_worker.js|manifest.json)).)*$/],
   dynamicUrlToDependencies: dynamicUrlToDependencies,
@@ -75,53 +75,13 @@ const options = {
   verbose: true,
 };
 
-const devBase = 'console.warn("Service worker caching disabled in development")';
+var devBase = 'console.warn("Service worker caching disabled in development")';
 
-const notify = `
-self.addEventListener("push", function(event) {
-  var data;
-  if (event.data) {
-    data = event.data.json();
-    event.waitUntil(self.registration.showNotification(data.title, data));
-  }
-});
-self.addEventListener('notificationclick', function(event) {
-  var url;
+var swHass = fs.readFileSync(path.resolve(__dirname, 'service-worker.js.tmpl'), 'UTF-8')
 
-  if (!event.notification.data || !event.notification.data.url) {
-    return;
-  }
+var genPromise = DEV ? Promise.resolve(devBase) : swPrecache.generate(options);
 
-  event.notification.close();
-  url = event.notification.data.url;
-
-  if (!url) return;
-
-  event.waitUntil(
-    clients.matchAll({
-      type: 'window',
-    })
-    .then(function (windowClients) {
-      var i;
-      var client;
-      for (i = 0; i < windowClients.length; i++) {
-        client = windowClients[i];
-        if (client.url === url && 'focus' in client) {
-            return client.focus();
-        }
-      }
-      if (clients.openWindow) {
-        return clients.openWindow(url);
-      }
-      return undefined;
-    })
-  );
-});
-`;
-
-let genPromise = DEV ? Promise.resolve(devBase) : swPrecache.generate(options);
-
-genPromise = genPromise.then(swString => swString + '\n' + notify);
+genPromise = genPromise.then(swString => swString + '\n' + swHass);
 
 if (!DEV) {
   genPromise = genPromise.then(
@@ -130,5 +90,5 @@ if (!DEV) {
 
 genPromise.then(
   swString =>
-    fs.writeFileSync(path.join('build', 'service_worker.js'), swString)
+    fs.writeFileSync(path.resolve(__dirname, '../build/service_worker.js'), swString)
 ).catch(err => console.error(err));
diff --git a/script/service-worker.js.tmpl b/script/service-worker.js.tmpl
new file mode 100644
index 0000000000..dc2feadd25
--- /dev/null
+++ b/script/service-worker.js.tmpl
@@ -0,0 +1,39 @@
+self.addEventListener("push", function(event) {
+  var data;
+  if (event.data) {
+    data = event.data.json();
+    event.waitUntil(self.registration.showNotification(data.title, data));
+  }
+});
+self.addEventListener('notificationclick', function(event) {
+  var url;
+
+  if (!event.notification.data || !event.notification.data.url) {
+    return;
+  }
+
+  event.notification.close();
+  url = event.notification.data.url;
+
+  if (!url) return;
+
+  event.waitUntil(
+    clients.matchAll({
+      type: 'window',
+    })
+    .then(function (windowClients) {
+      var i;
+      var client;
+      for (i = 0; i < windowClients.length; i++) {
+        client = windowClients[i];
+        if (client.url === url && 'focus' in client) {
+            return client.focus();
+        }
+      }
+      if (clients.openWindow) {
+        return clients.openWindow(url);
+      }
+      return undefined;
+    })
+  );
+});