diff --git a/monkey/common/utils/exceptions.py b/monkey/common/utils/exceptions.py
index dd84380f6..cc70cbc51 100644
--- a/monkey/common/utils/exceptions.py
+++ b/monkey/common/utils/exceptions.py
@@ -10,11 +10,7 @@ class InvalidRegistrationCredentialsError(Exception):
     """ Raise when server config file changed and island needs to restart """
 
 
-class RegistrationNotNeededError(Exception):
-    """ Raise to indicate the reason why registration is not required """
-
-
-class AlreadyRegisteredError(RegistrationNotNeededError):
+class AlreadyRegisteredError(Exception):
     """ Raise to indicate the reason why registration is not required """
 
 
diff --git a/monkey/monkey_island/cc/resources/auth/registration.py b/monkey/monkey_island/cc/resources/auth/registration.py
index bc9f3086f..175582733 100644
--- a/monkey/monkey_island/cc/resources/auth/registration.py
+++ b/monkey/monkey_island/cc/resources/auth/registration.py
@@ -3,7 +3,7 @@ import logging
 import flask_restful
 from flask import make_response, request
 
-from common.utils.exceptions import InvalidRegistrationCredentialsError, RegistrationNotNeededError
+from common.utils.exceptions import AlreadyRegisteredError, InvalidRegistrationCredentialsError
 from monkey_island.cc.resources.auth.credential_utils import get_username_password_from_request
 from monkey_island.cc.services import AuthenticationService
 
@@ -20,5 +20,5 @@ class Registration(flask_restful.Resource):
         try:
             AuthenticationService.register_new_user(username, password)
             return make_response({"error": ""}, 200)
-        except (InvalidRegistrationCredentialsError, RegistrationNotNeededError) as e:
+        except (InvalidRegistrationCredentialsError, AlreadyRegisteredError) as e:
             return make_response({"error": str(e)}, 400)
diff --git a/monkey/tests/unit_tests/monkey_island/cc/resources/auth/test_registration.py b/monkey/tests/unit_tests/monkey_island/cc/resources/auth/test_registration.py
index 0b1b60251..041eec264 100644
--- a/monkey/tests/unit_tests/monkey_island/cc/resources/auth/test_registration.py
+++ b/monkey/tests/unit_tests/monkey_island/cc/resources/auth/test_registration.py
@@ -3,7 +3,7 @@ from unittest.mock import MagicMock
 
 import pytest
 
-from common.utils.exceptions import InvalidRegistrationCredentialsError, RegistrationNotNeededError
+from common.utils.exceptions import AlreadyRegisteredError, InvalidRegistrationCredentialsError
 
 REGISTRATION_URL = "/api/registration"
 
@@ -59,9 +59,7 @@ def test_invalid_credentials(make_registration_request, mock_authentication_serv
 
 
 def test_registration_not_needed(make_registration_request, mock_authentication_service):
-    mock_authentication_service.register_new_user = MagicMock(
-        side_effect=RegistrationNotNeededError()
-    )
+    mock_authentication_service.register_new_user = MagicMock(side_effect=AlreadyRegisteredError())
 
     registration_request_body = "{}"
     response = make_registration_request(registration_request_body)