diff --git a/packages/server/src/server/websocket-server.notifications.test.ts b/packages/server/src/server/websocket-server.notifications.test.ts
index dbe0622967..0772e7bd5a 100644
--- a/packages/server/src/server/websocket-server.notifications.test.ts
+++ b/packages/server/src/server/websocket-server.notifications.test.ts
@@ -174,6 +174,7 @@ function createSessionWithActivity(
   return {
     getClientActivity: vi.fn(() => activity),
     supports: () => false,
+    supportsForSource: () => false,
   };
 }