diff --git a/tox.ini b/tox.ini
index 73bec1f..2cffe80 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,6 +13,11 @@ commands =
     python setup.py flake8
     nosetests flake8.tests._test_warnings
 
+[testenv:py26]
+deps =
+  mock==1.0.1
+  nose
+
 [testenv:py27-flake8]
 basepython = python2.7
 deps =