six is now required at build time
diff --git a/setup.py b/setup.py
index 0776ba6..2ff57e9 100644
--- a/setup.py
+++ b/setup.py
@@ -23,15 +23,11 @@
 CFFI_DEPENDENCY = "cffi>=0.6"
 SIX_DEPENDENCY = "six>=1.4.1"
 
-install_requires = [
+requirements = [
     CFFI_DEPENDENCY,
     SIX_DEPENDENCY
 ]
 
-setup_requires = [
-    CFFI_DEPENDENCY,
-]
-
 
 class cffi_build(build):
     def finalize_options(self):
@@ -81,8 +77,8 @@
 
     packages=find_packages(exclude=["tests", "tests.*"]),
 
-    install_requires=install_requires,
-    setup_requires=setup_requires,
+    install_requires=requirements,
+    setup_requires=requirements,
 
     # for cffi
     zip_safe=False,