diff --git a/tox.ini b/tox.ini
index 8b91c6b7..48676e46 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@ envlist = py26,py27,docs
 [testenv]
 deps = nose
 commands = nosetests []
+sitepackages = True
 
 [testenv:docs]
 basepython = python