diff --git a/frontend/src/test/appPacketIsolation.test.tsx b/frontend/src/test/appPacketIsolation.test.tsx
index 320cdaa..fd49dd2 100644
--- a/frontend/src/test/appPacketIsolation.test.tsx
+++ b/frontend/src/test/appPacketIsolation.test.tsx
@@ -81,6 +81,7 @@ vi.mock('../hooks', async (importOriginal) => {
       mentions: {},
       lastMessageTimes: {},
       unreadLastReadAts: {},
+      firstUnreadIds: {},
       recordMessageEvent: vi.fn(),
       renameConversationState: vi.fn(),
       removeConversationState: vi.fn(),