diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index f6c0a6fe1d..4d5c3c78a3 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -505,11 +505,10 @@ export class ApPersonService implements OnModuleInit {
 		this.hashtagService.updateUsertags(exist, tags);
 
 		// 該当ユーザーが既にフォロワーになっていた場合はFollowingもアップデートする
-		await this.followingsRepository.update({
-			followerId: exist.id,
-		}, {
-			followerSharedInbox: person.sharedInbox ?? (person.endpoints ? person.endpoints.sharedInbox : undefined),
-		});
+		await this.followingsRepository.update(
+			{ followerId: exist.id },
+			{ followerSharedInbox: person.sharedInbox ?? person.endpoints?.sharedInbox },
+		);
 
 		await this.updateFeatured(exist.id, resolver).catch(err => this.logger.error(err));