diff --git a/tox.ini b/tox.ini
index 45514ea..01d6637 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ envlist = py27,py33,py34,py35,flake8
 deps =
     mock
     pytest
-    py27: configparser
+    pypy,py27: configparser
 commands =
     py.test {posargs}