diff --git a/tox.ini b/tox.ini
index fb3816a..92fa9e3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,10 @@
 [tox]
-envlist = py26,py27,flake8
+envlist = py27,py34,flake8
 minversion = 1.6
+skipsdist = True
 
 [testenv]
-sitepackages = False
+usedevelop = True
 install_command = pip install {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          LANG=en_US.UTF-8