diff --git a/Dockerfile b/Dockerfile
index d31728eafb5..2783f5180bf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -52,7 +52,7 @@ ENV LANG en_US.UTF-8
 ENV LC_ALL en_US.UTF-8
 
 RUN yum install -y python-pip
-RUN pip install --upgrade pip setuptools
+RUN pip install --upgrade pip six setuptools
 
 # Until https://github.com/shazow/urllib3/commit/959d47d926e1331ad571dbfc150c9a3acb7a1eb9 lands
 RUN pip install pyOpenSSL ndg-httpsclient pyasn1 certifi urllib3