diff --git a/tox.ini b/tox.ini
index af0281a7..bb925116 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 envlist=py26,py27,py33,pypy
 
 [testenv]
-commands=py.test
+commands=py.test []
 deps=pytest
 
 [testenv:py26]