diff --git a/tempest/api/object_storage/test_account_services.py b/tempest/api/object_storage/test_account_services.py
index 2fb676f..0f3dd27 100644
--- a/tempest/api/object_storage/test_account_services.py
+++ b/tempest/api/object_storage/test_account_services.py
@@ -43,7 +43,7 @@
     def resource_setup(cls):
         super(AccountTest, cls).resource_setup()
         for i in range(ord('a'), ord('f') + 1):
-            name = data_utils.rand_name(name='%s-' % chr(i))
+            name = data_utils.rand_name(name='%s-' % six.int2byte(i))
             cls.container_client.create_container(name)
             cls.containers.append(name)
         cls.containers_count = len(cls.containers)
diff --git a/tempest/tests/lib/test_ssh.py b/tempest/tests/lib/test_ssh.py
index a16da1c..37fe646 100644
--- a/tempest/tests/lib/test_ssh.py
+++ b/tempest/tests/lib/test_ssh.py
@@ -12,11 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from io import StringIO
 import socket
 
 import mock
 import six
+from six import StringIO
 import testtools
 
 from tempest.lib.common import ssh