1 files changed, 3 insertions, 2 deletions

diff --git a/src/mailman/config/tests/test_configuration.py b/src/mailman/config/tests/test_configuration.py
index f3a49d64f..b411f9615 100644
--- a/src/mailman/config/tests/test_configuration.py
+++ b/src/mailman/config/tests/test_configuration.py
@@ -28,6 +28,7 @@ __all__ = [
 
 
 import os
+import six
 import mock
 import tempfile
 import unittest
@@ -79,12 +80,12 @@ class TestExternal(unittest.TestCase):
     def test_load_external_by_filename_as_string(self):
         filename = resource_filename('mailman.config', 'postfix.cfg')
         contents = load_external(filename, encoding='utf-8')
-        self.assertIsInstance(contents, unicode)
+        self.assertIsInstance(contents, six.text_type)
         self.assertEqual(contents[:9], '[postfix]')
 
     def test_load_external_by_path_as_string(self):
         contents = load_external('python:mailman.config.postfix', 'utf-8')
-        self.assertIsInstance(contents, unicode)
+        self.assertIsInstance(contents, six.text_type)
         self.assertEqual(contents[:9], '[postfix]')
 
     def test_external_configuration_by_filename(self):