--- a/cubicweb/test/unittest_cwctl.py	Fri Apr 05 17:21:14 2019 +0200
+++ b/cubicweb/test/unittest_cwctl.py	Fri Apr 05 17:58:19 2019 +0200
@@ -18,11 +18,9 @@
 import sys
 import os
 from os.path import join
-from io import StringIO, BytesIO
+from io import StringIO
 import unittest
 
-from six import PY2
-
 from mock import patch
 
 from cubicweb.cwctl import ListCommand
@@ -38,7 +36,7 @@
     tearDownClass = unittest_cwconfig.CubicWebConfigurationTC.tearDownClass
 
     def setUp(self):
-        self.stream = BytesIO() if PY2 else StringIO()
+        self.stream = StringIO()
         sys.stdout = self.stream
 
     def tearDown(self):