diff --git a/backend/app/auth/signup_routes.py b/backend/app/auth/signup_routes.py
index 77874df..592d24b 100644
--- a/backend/app/auth/signup_routes.py
+++ b/backend/app/auth/signup_routes.py
@@ -46,7 +46,7 @@ async def signup_request(
     try:
         # 중복 사용자명 확인
         user_repo = UserRepository(db)
-        existing_user = user_repo.get_user_by_username(signup_data.username)
+        existing_user = user_repo.find_by_username(signup_data.username)
         
         if existing_user:
             raise HTTPException(