diff --git a/tox.ini b/tox.ini
index bd7916d..09a8578 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,5 +18,6 @@ deps =
   pytest-cov
   pytest-django
   xmlschema<1.1
+  py2: enum34<=1.1.6
 commands =
   py.test {posargs: {env:JUNIT:} {env:COVERAGE:} tests/}