diff --git a/src/vector/index.ts b/src/vector/index.ts
index d9c63755f6..02e2025c91 100644
--- a/src/vector/index.ts
+++ b/src/vector/index.ts
@@ -29,11 +29,6 @@ require('katex/dist/katex.css');
 import {parseQsFromFragment} from "./url_utils";
 import './modernizr';
 
-// load service worker if available on this platform
-if ('serviceWorker' in navigator) {
-    navigator.serviceWorker.register('sw.js');
-}
-
 async function settled(...promises: Array<Promise<any>>) {
     for (const prom of promises) {
         try {
diff --git a/src/vector/platform/WebPlatform.ts b/src/vector/platform/WebPlatform.ts
index ee399c8c8c..9f9f4a3995 100644
--- a/src/vector/platform/WebPlatform.ts
+++ b/src/vector/platform/WebPlatform.ts
@@ -34,6 +34,14 @@ const POKE_RATE_MS = 10 * 60 * 1000; // 10 min
 export default class WebPlatform extends VectorBasePlatform {
     private runningVersion: string = null;
 
+    constructor() {
+        super();
+        // Register service worker if available on this platform
+        if ('serviceWorker' in navigator) {
+            navigator.serviceWorker.register('sw.js');
+        }
+    }
+
     getHumanReadableName(): string {
         return 'Web Platform'; // no translation required: only used for analytics
     }