diff --git a/CHANGES.rst b/CHANGES.rst
index 8d4fa39..4e5afbd 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,7 +4,8 @@ Alterações
 2.0.3 (unreleased)
 ^^^^^^^^^^^^^^^^^^
 
-- Nothing changed yet.
+- Adiciona dependência no `six <https://pypi.org/project/six/>`_ para futura compatibilidade com Python 3.
+  [hvelarde]
 
 
 2.0.2 (2017-12-22)
diff --git a/setup.py b/setup.py
index 3d066e1..a35b2cb 100644
--- a/setup.py
+++ b/setup.py
@@ -46,6 +46,7 @@
           'raptus.autocompletewidget',
           'rdflib',
           'setuptools',
+          'six',
           'zope.component',
           'z3c.form',
           'zope.interface',
diff --git a/src/brasil/gov/vcge/browser/viewlets.py b/src/brasil/gov/vcge/browser/viewlets.py
index 1ad4f4c..fa3e398 100644
--- a/src/brasil/gov/vcge/browser/viewlets.py
+++ b/src/brasil/gov/vcge/browser/viewlets.py
@@ -1,11 +1,11 @@
 # -*- coding: utf-8 -*-
 """Modulo que implementa o(s) viewlet(s) do VCGE."""
+from six.moves.urllib.parse import urlencode  # noqa: I001
 from Acquisition import aq_base
 from Acquisition import aq_inner
 from plone.app.layout.viewlets import ViewletBase
 from Products.CMFPlone.utils import safe_hasattr
 from Products.Five.browser.pagetemplatefile import ViewPageTemplateFile
-from urllib import urlencode
 from zope.component import queryUtility
 from zope.schema.interfaces import IVocabularyFactory