diff --git a/packages/backend/src/core/entities/DriveFileEntityService.ts b/packages/backend/src/core/entities/DriveFileEntityService.ts
index c485555f90..a172f81eed 100644
--- a/packages/backend/src/core/entities/DriveFileEntityService.ts
+++ b/packages/backend/src/core/entities/DriveFileEntityService.ts
@@ -3,8 +3,9 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { forwardRef, Inject, Injectable } from '@nestjs/common';
+import { Inject, Injectable, OnModuleInit } from '@nestjs/common';
 import { In } from 'typeorm';
+import { ModuleRef } from '@nestjs/core';
 import { DI } from '@/di-symbols.js';
 import type { DriveFilesRepository } from '@/models/_.js';
 import type { Config } from '@/config.js';
@@ -19,8 +20,8 @@ import { isMimeImage } from '@/misc/is-mime-image.js';
 import { IdService } from '@/core/IdService.js';
 import { UtilityService } from '../UtilityService.js';
 import { VideoProcessingService } from '../VideoProcessingService.js';
-import { UserEntityService } from './UserEntityService.js';
 import { DriveFolderEntityService } from './DriveFolderEntityService.js';
+import type { UserEntityService } from './UserEntityService.js';
 
 type PackOptions = {
 	detail?: boolean,
@@ -29,18 +30,18 @@ type PackOptions = {
 };
 
 @Injectable()
-export class DriveFileEntityService {
+export class DriveFileEntityService implements OnModuleInit {
+	private userEntityService: UserEntityService;
+
 	constructor(
+		private readonly moduleRef: ModuleRef,
+
 		@Inject(DI.config)
 		private config: Config,
 
 		@Inject(DI.driveFilesRepository)
 		private driveFilesRepository: DriveFilesRepository,
 
-		// 循環参照のため / for circular dependency
-		@Inject(forwardRef(() => UserEntityService))
-		private userEntityService: UserEntityService,
-
 		private utilityService: UtilityService,
 		private driveFolderEntityService: DriveFolderEntityService,
 		private videoProcessingService: VideoProcessingService,
@@ -48,6 +49,11 @@ export class DriveFileEntityService {
 	) {
 	}
 
+	@bindThis
+	public onModuleInit() {
+		this.userEntityService = this.moduleRef.get('UserEntityService');
+	}
+
 	@bindThis
 	public validateFileName(name: string): boolean {
 		return (