diff --git a/backend/src/controllers/userController.ts b/backend/src/controllers/userController.ts
index 5d9f4ea..4e99460 100644
--- a/backend/src/controllers/userController.ts
+++ b/backend/src/controllers/userController.ts
@@ -2,6 +2,7 @@ import { Request, Response } from 'express';
 import { prisma } from '../config/database';
 import { AuthRequest } from '../middleware/auth';
 import bcrypt from 'bcryptjs';
+import { Prisma } from '@prisma/client';
 
 export const userController = {
   // 获取所有用户 (管理员)
@@ -229,7 +230,7 @@ export const userController = {
     }
 
     // 使用事务来确保数据一致性
-    await prisma.$transaction(async (tx) => {
+    await prisma.$transaction(async (tx: Prisma.TransactionClient) => {
       // 删除用户现有的所有账号分配
       await tx.accountAssignment.deleteMany({
         where: { userId: id }