diff --git a/packages/backend/test/unit/NoteCreateService.ts b/packages/backend/test/unit/NoteCreateService.ts
index f2d4c8ffbb..ccf9ed1e6d 100644
--- a/packages/backend/test/unit/NoteCreateService.ts
+++ b/packages/backend/test/unit/NoteCreateService.ts
@@ -25,6 +25,7 @@ describe('NoteCreateService', () => {
 	describe('is-renote', () => {
 		const base: MiNote = {
 			id: 'some-note-id',
+			updatedAt: null,
 			replyId: null,
 			reply: null,
 			renoteId: null,