grump
diff --git a/tox.ini b/tox.ini
index 5925b07..9e0f6c9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -51,7 +51,7 @@
     doc8 --allow-long-titles README.rst docs/
 
 [testenv:py3pep8]
-basepython = python3
+basepython = python3.3
 deps =
     doc8
     flake8