diff --git a/setup.py b/setup.py
index 5299469432e3be8a21f61fee549043802cddb8b1..f0526c449fda6d6ac38b6c3f472ab8d71bfa7940 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@ class PyTest(TestCommand):
 here = os.path.abspath(os.path.dirname(__file__))
 README = open(os.path.join(here, 'README.rst')).read()
 
-requirements = ['requests']
+requirements = ['requests', 'six']
 if sys.version_info < (2, 7):
     requirements.append('ordereddict')