diff -r 6b3523f81f42 -r 26744ad37953 cubicweb/server/test/unittest_checkintegrity.py
--- a/cubicweb/server/test/unittest_checkintegrity.py	Fri Apr 05 17:21:14 2019 +0200
+++ b/cubicweb/server/test/unittest_checkintegrity.py	Fri Apr 05 17:58:19 2019 +0200
@@ -16,15 +16,10 @@
 # You should have received a copy of the GNU Lesser General Public License along
 # with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
 
+from io import StringIO
 import sys
 import unittest
 
-from six import PY2
-if PY2:
-    from StringIO import StringIO
-else:
-    from io import StringIO
-
 from cubicweb import devtools  # noqa: E402
 from cubicweb.devtools.testlib import CubicWebTC  # noqa: E402
 from cubicweb.server.checkintegrity import check, check_indexes, reindex_entities  # noqa: E402