diff --git a/src/service-worker.js b/src/service-worker.js
index 2289a556..8776dac4 100644
--- a/src/service-worker.js
+++ b/src/service-worker.js
@@ -43,7 +43,7 @@ self.addEventListener('fetch', event => {
 	if (url.hostname === self.location.hostname && url.port !== self.location.port) return;
 
 	// always serve static files and bundler-generated assets from cache
-	if (url.host === self.location.host && cached.has(url.pathname)) {
+	if (url.host === self.location.host && cached.has(url.pathname.slice(1))) {
 		event.respondWith(caches.match(event.request));
 		return;
 	}