diff --git a/web/src/hooks/usePushNotifications.ts b/web/src/hooks/usePushNotifications.ts
index 277b730..28c5e47 100644
--- a/web/src/hooks/usePushNotifications.ts
+++ b/web/src/hooks/usePushNotifications.ts
@@ -68,7 +68,7 @@ export function usePushNotifications() {
     const registration = await navigator.serviceWorker.ready;
     const subscription = await registration.pushManager.subscribe({
       userVisibleOnly: true,
-      applicationServerKey,
+      applicationServerKey: applicationServerKey.buffer as ArrayBuffer,
     });
 
     const json = subscription.toJSON();