diff --git a/setup.py b/setup.py
index 201642ef48cc1bbc4fcc27555b684cfb3fab3052..9eb801ef96344782268f9820f236e26509daed3a 100755
--- a/setup.py
+++ b/setup.py
@@ -99,4 +99,4 @@ if __name__ == '__main__':
           zip_safe=False,
           test_suite='selftests',
           python_requires='>=2.7',
-          install_requires=['stevedore>=0.14'])
+          install_requires=['stevedore>=0.14', 'six>=1.10.0'])