1 files changed, 3 insertions, 1 deletions

diff --git a/src/mailman/utilities/i18n.py b/src/mailman/utilities/i18n.py
index e22bd6c18..e9136837f 100644
--- a/src/mailman/utilities/i18n.py
+++ b/src/mailman/utilities/i18n.py
@@ -29,6 +29,7 @@ __all__ = [
 
 
 import os
+import six
 import sys
 import errno
 
@@ -203,7 +204,8 @@ def make(template_file, mlist=None, language=None, wrap=True,
         template = _(fp.read()[:-1])
     finally:
         fp.close()
-    assert isinstance(template, unicode), 'Translated template is not unicode'
+    assert isinstance(template, six.text_type), (
+        'Translated template is not unicode')
     text = expand(template, kw)
     if wrap:
         return wrap_text(text)