diff --git a/packages/backend/src/core/activitypub/ApInboxService.ts b/packages/backend/src/core/activitypub/ApInboxService.ts
index 78c4ce0432..8b4fd29cab 100644
--- a/packages/backend/src/core/activitypub/ApInboxService.ts
+++ b/packages/backend/src/core/activitypub/ApInboxService.ts
@@ -332,7 +332,7 @@ export class ApInboxService {
 
 		try {
 			// 既に同じURIを持つものが登録されていないかチェック
-			const exist = await this.apNoteService.fetchNote(fromRelay ? targetUri : uri);
+			const exist = await this.apNoteService.fetchNote(fromRelay ? target : uri);
 			if (exist) {
 				return;
 			}