diff --git a/tempest/tests/test_wrappers.py b/tempest/tests/test_wrappers.py
index ae7860d..a4ef699 100644
--- a/tempest/tests/test_wrappers.py
+++ b/tempest/tests/test_wrappers.py
@@ -14,10 +14,11 @@
 
 import os
 import shutil
-import StringIO
 import subprocess
 import tempfile
 
+import six
+
 from tempest.tests import base
 
 DEVNULL = open(os.devnull, 'wb')
@@ -50,8 +51,8 @@
         shutil.copy('tools/pretty_tox_serial.sh',
                     os.path.join(self.directory, 'pretty_tox_serial.sh'))
 
-        self.stdout = StringIO.StringIO()
-        self.stderr = StringIO.StringIO()
+        self.stdout = six.StringIO()
+        self.stderr = six.StringIO()
         # Change directory, run wrapper and check result
         self.addCleanup(os.chdir, os.path.abspath(os.curdir))
         os.chdir(self.directory)