diff --git a/python/mozterm/mozterm/terminal.py b/python/mozterm/mozterm/terminal.py
index db4cdf3a110f..27cdebc43d3d 100644
--- a/python/mozterm/mozterm/terminal.py
+++ b/python/mozterm/mozterm/terminal.py
@@ -7,6 +7,8 @@ from __future__ import absolute_import, unicode_literals
 import os
 import sys
 
+import six
+
 
 class NullTerminal(object):
     """Replacement for `blessings.Terminal()` that does no formatting."""
@@ -21,10 +23,10 @@ class NullTerminal(object):
         except Exception:
             self.is_a_tty = False
 
-    class NullCallableString(unicode):
+    class NullCallableString(six.text_type):
         """A dummy callable Unicode stolen from blessings"""
         def __new__(cls):
-            new = unicode.__new__(cls, '')
+            new = six.text_type.__new__(cls, '')
             return new
 
         def __call__(self, *args):
diff --git a/python/mozterm/setup.py b/python/mozterm/setup.py
index f4a4c198deab..e30f31f6e76b 100644
--- a/python/mozterm/setup.py
+++ b/python/mozterm/setup.py
@@ -7,7 +7,7 @@ from __future__ import absolute_import
 from setuptools import setup
 
 VERSION = '0.1.0'
-DEPS = []
+DEPS = ['six >= 1.10.0']
 
 setup(
     name='mozterm',
@@ -23,6 +23,10 @@ setup(
         'Development Status :: 3 - Alpha',
         'License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)',
         'Natural Language :: English',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.5',
     ],
     install_requires=DEPS,
 )