diff --git a/app/views/pwa/service_worker.js.erb b/app/views/pwa/service_worker.js.erb
index 095595f4e..41fac1446 100644
--- a/app/views/pwa/service_worker.js.erb
+++ b/app/views/pwa/service_worker.js.erb
@@ -42,7 +42,8 @@ TurboOffline.addRule({
     maxAge: 60 * 60 * 24 * 7,
     networkTimeout: 2,
     maxEntrySize: 2 * 1024 * 1024, // 2MB covers about 95% of all Fizzy blobs
-    maxEntries: 500
+    maxEntries: 500,
+    fetchOptions: { mode: "cors" }
   })
 })