1 files changed, 1 insertions, 1 deletions

diff --git a/src/mailman/core/runner.py b/src/mailman/core/runner.py
index f198a4641..75dc644b3 100644
--- a/src/mailman/core/runner.py
+++ b/src/mailman/core/runner.py
@@ -27,6 +27,7 @@ import signal
 import logging
 import traceback
 
+from io import StringIO
 from lazr.config import as_boolean, as_timedelta
 from mailman.config import config
 from mailman.core.i18n import _
@@ -36,7 +37,6 @@ from mailman.interfaces.languages import ILanguageManager
 from mailman.interfaces.listmanager import IListManager
 from mailman.interfaces.runner import IRunner, RunnerCrashEvent
 from mailman.utilities.string import expand
-from six.moves import cStringIO as StringIO
 from zope.component import getUtility
 from zope.event import notify
 from zope.interface import implementer