diff --git a/static/demos/light-dark-demo-4/sw.js b/static/demos/light-dark-demo-4/sw.js
index b358a77..6d724c8 100644
--- a/static/demos/light-dark-demo-4/sw.js
+++ b/static/demos/light-dark-demo-4/sw.js
@@ -1,3 +1,3 @@
 self.addEventListener("fetch", event =>{
-    event.respondWith("hi");
+    event.respondWith(new Response("hi"));
 })