diff --git a/packages/backend/src/core/WebhookTestService.ts b/packages/backend/src/core/WebhookTestService.ts
index 4c45b95a64..3bfcf97ec6 100644
--- a/packages/backend/src/core/WebhookTestService.ts
+++ b/packages/backend/src/core/WebhookTestService.ts
@@ -133,6 +133,7 @@ function generateDummyNote(override?: Partial<MiNote>): MiNote {
 		replyUserHost: null,
 		renoteUserId: null,
 		renoteUserHost: null,
+		renoteChannelId: null,
 		...override,
 	};
 }