diff --git a/app/worker.ts b/app/worker.ts
index 40c5981..3a59d03 100644
--- a/app/worker.ts
+++ b/app/worker.ts
@@ -57,15 +57,15 @@ export default function start(self: ServiceWorkerGlobalScope) {
         })
 
         if (
-          "type" in event &&
-          event.type === "subscribed" &&
-          "subscription" in event
+          "type" in event.data &&
+          event.data.type === "subscribed" &&
+          "subscription" in event.data
         ) {
           try {
             await event.waitUntil(
               submitSubscription(
                 self.registration,
-                event.subscription as PushSubscription
+                event.data.subscription as PushSubscription
               )
             )
           } catch (e) {