diff --git a/setup.py b/setup.py
index 55dee45..c0fa969 100644
--- a/setup.py
+++ b/setup.py
@@ -31,6 +31,7 @@ setup(
         'simplejson',
         'six',
     ],
+    extras_require={':python_version=="2.7"': ['enum34']},
     entry_points={
         'console_scripts': [
             'autopep8-wrapper = pre_commit_hooks.autopep8_wrapper:main',