diff --git a/tox.ini b/tox.ini
index 58631d37..b1837605 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,10 @@
 [tox]
 envlist = py26,py27,py33,pypy,pep8
+minversion = 1.6
+skipsdist = True
 
 [testenv]
+usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          LANG=en_US.UTF-8