diff --git a/tox.ini b/tox.ini
index e50904e0..7024c947 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,12 +6,14 @@ basepython = python2.7
 sitepackages = True
 passenv = HOME
 whitelist_externals = bash
+deps = future
 
 [testenv:unit]
 deps =
     nose
     mox
     mock
+    future
 commands =
     nosetests -v tests/unit
     python ./share/make_supported.py /dev/null
@@ -23,5 +25,6 @@ commands =
 [testenv:style]
 deps =
     pep8==1.6.2
+    future
 commands =
     python ./tools/cpep8.py