diff --git a/samples/client/petstore/python/test/test_fake_api.py b/samples/client/petstore/python/test/test_fake_api.py
index c8345a8760a..d17375a994d 100644
--- a/samples/client/petstore/python/test/test_fake_api.py
+++ b/samples/client/petstore/python/test/test_fake_api.py
@@ -126,6 +126,7 @@ class TestFakeApi(unittest.TestCase):
                 _preload_content=True,
                 _request_timeout=None,
                 _return_http_data_only=True,
+                _spec_property_naming=False,
                 async_req=False,
                 header_number=1.234,
                 path_integer=34,
diff --git a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/test/test_fake_api.py b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/test/test_fake_api.py
index c8345a8760a..d17375a994d 100644
--- a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/test/test_fake_api.py
+++ b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/test/test_fake_api.py
@@ -126,6 +126,7 @@ class TestFakeApi(unittest.TestCase):
                 _preload_content=True,
                 _request_timeout=None,
                 _return_http_data_only=True,
+                _spec_property_naming=False,
                 async_req=False,
                 header_number=1.234,
                 path_integer=34,