diff --git a/python/az/aro/azext_aro/_validators.py b/python/az/aro/azext_aro/_validators.py
index bdc2cc75d78..96b8941323a 100644
--- a/python/az/aro/azext_aro/_validators.py
+++ b/python/az/aro/azext_aro/_validators.py
@@ -285,7 +285,7 @@ def validate_refresh_cluster_credentials(namespace):
     if namespace.client_secret is not None or namespace.client_id is not None:
         raise RequiredArgumentMissingError('--client-id and --client-secret must be not set with --refresh-credentials.')  # pylint: disable=line-too-long
     if namespace.upgradeable_to is not None:
-        raise MutuallyExclusiveArgumentError('Must not specify --refresh-credentials when --upgradeable-to is used.') # pylint: disable=line-too-long
+        raise MutuallyExclusiveArgumentError('Must not specify --refresh-credentials when --upgradeable-to is used.')  # pylint: disable=line-too-long
 
 
 def validate_version_format(namespace):
diff --git a/python/az/aro/azext_aro/tests/latest/unit/test_validators.py b/python/az/aro/azext_aro/tests/latest/unit/test_validators.py
index d02a823e14d..8a6390f4d72 100644
--- a/python/az/aro/azext_aro/tests/latest/unit/test_validators.py
+++ b/python/az/aro/azext_aro/tests/latest/unit/test_validators.py
@@ -821,7 +821,7 @@ def test_validate_worker_vm_disk_size_gb(test_description, namespace, expected_e
         None
     ), 
     (
-        "should raise RequiredArgumentMissingError Exception because namespace.upgradeable_to is not None",
+        "should raise MutuallyExclusiveArgumentError exception because namespace.upgradeable_to is not None",
         Mock(upgradeable_to="4.14.2", client_id=None, client_secret=None),
         MutuallyExclusiveArgumentError
     ),