diff --git a/backend/moment/moment-server/auth/src/main/java/com/moment/auth/dto/request/AuthRequest.java b/backend/moment/moment-server/auth/src/main/java/com/moment/auth/dto/request/AuthRequest.java
index 1973a50b71..2d55043556 100644
--- a/backend/moment/moment-server/auth/src/main/java/com/moment/auth/dto/request/AuthRequest.java
+++ b/backend/moment/moment-server/auth/src/main/java/com/moment/auth/dto/request/AuthRequest.java
@@ -25,7 +25,7 @@ public static class Login {
     @Setter
     public static class SendCode {
         private String email;
-        private boolean isSignUp;
+        private String isSignUp;
     }
 
     @Getter
diff --git a/backend/moment/moment-server/auth/src/main/java/com/moment/auth/service/AuthService.java b/backend/moment/moment-server/auth/src/main/java/com/moment/auth/service/AuthService.java
index df176b7cd5..9cf91a3d3c 100644
--- a/backend/moment/moment-server/auth/src/main/java/com/moment/auth/service/AuthService.java
+++ b/backend/moment/moment-server/auth/src/main/java/com/moment/auth/service/AuthService.java
@@ -39,7 +39,7 @@ public TokenResponseDTO.GetToken login(AuthRequest.Login login) {
     @Transactional
     public TokenResponseDTO.GetTempToken sendCode(AuthRequest.SendCode sendCode) {
         log.info("sendCode.isSignUp : {}", sendCode.isSignUp());
-        if (sendCode.isSignUp()) {
+        if (sendCode.isSignUp().equals("true")) {
             if(userRepository.existsByEmail(sendCode.getEmail())){
                 throw new AlreadyRegisteredEmailException("이미 가입된 이메일");
             }