diff --git a/tox.ini b/tox.ini
index 2f1dbc8c..75301868 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,8 +2,8 @@
 envlist = py27,py34
 
 [testenv]
-deps = pytest
-commands = py.test []
+deps = pytest-xdist
+commands = py.test --basetemp={envtmpdir} {posargs}
 
 [testenv:docs]
 whitelist_externals = make