diff --git a/backend/app/auth/signup_routes.py b/backend/app/auth/signup_routes.py
index bf251bc..048363a 100644
--- a/backend/app/auth/signup_routes.py
+++ b/backend/app/auth/signup_routes.py
@@ -88,14 +88,14 @@ async def signup_request(
         
         # 가입 사유 저장 (notes 컬럼 활용)
         if signup_data.reason:
-            update_notes = text("UPDATE users SET notes = :reason WHERE id = :user_id")
-            db.execute(update_notes, {"reason": signup_data.reason, "user_id": new_user.id})
+            update_notes = text("UPDATE users SET notes = :reason WHERE user_id = :user_id")
+            db.execute(update_notes, {"reason": signup_data.reason, "user_id": new_user.user_id})
             db.commit()
         
         return {
             "success": True,
             "message": "회원가입 요청이 전송되었습니다. 관리자 승인 후 이용 가능합니다.",
-            "user_id": new_user.id,
+            "user_id": new_user.user_id,
             "username": new_user.username,
             "status": "pending_approval"
         }