diff --git a/os_client_config/cloud_config.py b/os_client_config/cloud_config.py
index 37029f1..30dc27f 100644
--- a/os_client_config/cloud_config.py
+++ b/os_client_config/cloud_config.py
@@ -259,15 +259,11 @@ class CloudConfig(object):
         if pass_version_arg:
             version = self.get_api_version(service_key)
             if service_key == 'identity':
-                # keystoneclient takes version as a tuple.
-                version = tuple(str(float(version)).split('.'))
-                constructor_kwargs['version'] = version
                 # Workaround for bug#1513839
                 if 'endpoint' not in constructor_kwargs:
                     endpoint = self.get_session_endpoint('identity')
                     constructor_kwargs['endpoint'] = endpoint
-            else:
-                constructor_args.append(version)
+            constructor_args.append(version)
 
         return client_class(*constructor_args, **constructor_kwargs)
 
diff --git a/os_client_config/tests/test_cloud_config.py b/os_client_config/tests/test_cloud_config.py
index deaec4d..1b98b8a 100644
--- a/os_client_config/tests/test_cloud_config.py
+++ b/os_client_config/tests/test_cloud_config.py
@@ -289,7 +289,7 @@ class TestCloudConfig(base.TestCase):
             "test1", "region-al", config_dict, auth_plugin=mock.Mock())
         cc.get_legacy_client('identity', mock_client)
         mock_client.assert_called_with(
-            version=('2', '0'),
+            '2.0',
             endpoint='http://example.com/v2',
             endpoint_type='admin',
             region_name='region-al',
@@ -308,7 +308,7 @@ class TestCloudConfig(base.TestCase):
             "test1", "region-al", config_dict, auth_plugin=mock.Mock())
         cc.get_legacy_client('identity', mock_client)
         mock_client.assert_called_with(
-            version=('3', '0'),
+            '3',
             endpoint='http://example.com',
             endpoint_type='admin',
             region_name='region-al',