diff --git a/tox.ini b/tox.ini
index 8f74e7d..1d8f4f4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py33
+envlist = py27, py32, py33
 
 [testenv]
 commands = py.test