diff --git a/packages/backend/src/core/UserFollowingService.ts b/packages/backend/src/core/UserFollowingService.ts
index a8eded6733..f32048bf38 100644
--- a/packages/backend/src/core/UserFollowingService.ts
+++ b/packages/backend/src/core/UserFollowingService.ts
@@ -22,6 +22,7 @@ import { MetaService } from '@/core/MetaService.js';
 import { CacheService } from '@/core/CacheService.js';
 import type { Config } from '@/config.js';
 import Logger from '../logger.js';
+import { ApPersonService } from '@/core/activitypub/models/ApPersonService.js';
 
 const logger = new Logger('following/create');
 
@@ -73,6 +74,7 @@ export class UserFollowingService implements OnModuleInit {
 		private federatedInstanceService: FederatedInstanceService,
 		private webhookService: WebhookService,
 		private apRendererService: ApRendererService,
+		private apPersonService: ApPersonService,
 		private perUserFollowingChart: PerUserFollowingChart,
 		private instanceChart: InstanceChart,
 	) {
@@ -137,6 +139,24 @@ export class UserFollowingService implements OnModuleInit {
 				if (followed) autoAccept = true;
 			}
 
+			// Automatically accept if the follower is an account who has moved and the locked followee had accepted the old account.
+			if (followee.isLocked && !autoAccept && follower.alsoKnownAs) {
+				for (const oldUri of follower.alsoKnownAs) {
+					try {
+						await this.apPersonService.updatePerson(oldUri);
+						const oldAccount = await this.apPersonService.resolvePerson(oldUri);
+						autoAccept = await this.followingsRepository.exist({
+							where: {
+								followeeId: followee.id,
+								followerId: oldAccount.id,
+							},
+						});
+					} catch {
+						/* skip if any error happens */
+					}
+				}
+			}
+
 			if (!autoAccept) {
 				await this.createFollowRequest(follower, followee, requestId);
 				return;
diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index 819e8b9bf5..21a53ea85f 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -217,7 +217,7 @@ export class ApPersonService implements OnModuleInit {
 		if (cached) return cached;
 
 		// URIがこのサーバーを指しているならデータベースからフェッチ
-		if (uri.startsWith(this.config.url + '/')) {
+		if (uri.startsWith(`${this.config.url}/`)) {
 			const id = uri.split('/').pop();
 			const u = await this.usersRepository.findOneBy({ id });
 			if (u) this.cacheService.uriPersonCache.set(uri, u);