diff --git a/tox.ini b/tox.ini
index 9bd2d88..62187d2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27
+envlist = py27,py33
 [testenv]
 deps=pytest
-commands=py.test tests/
\ No newline at end of file
+commands=py.test -v tests/