diff --git a/tox.ini b/tox.ini
index f72ad91b..c4fbef6f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 # Python Trove Client
 
 [tox]
-envlist = py26,py27,pypy,pep8
+envlist = py26,py27,py33,pypy,pep8
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}