diff --git a/src/modules/rag-chat/rag-chat.controller.ts b/src/modules/rag-chat/rag-chat.controller.ts
index 4842f57..2a98c0a 100644
--- a/src/modules/rag-chat/rag-chat.controller.ts
+++ b/src/modules/rag-chat/rag-chat.controller.ts
@@ -1,6 +1,6 @@
 import { Controller, Get, Post, Delete, Body, Param, Res } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
-import { Response } from 'express';
+import type { Response } from 'express';
 import { RagChatService } from './rag-chat.service';
 import { CurrentUser } from '../../common/decorators/current-user.decorator';
 import type { UserPayload } from '../../common/types';