diff --git a/setup.py b/setup.py
index 1d7b3d1c..22115c0c 100755
--- a/setup.py
+++ b/setup.py
@@ -141,6 +141,9 @@ if __name__ == "__main__":
         ],
 
         configuration=configuration,
+        install_requires=[
+            "six>=%s" % DEPENDENCIES['six']
+        ],
         packages=setuptools.find_packages(exclude=['doc']),
         include_package_data=True,
         zip_safe=False,  # the package can run out of an .egg file