diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100755
--- a/setup.py
+++ b/setup.py
@@ -21,6 +21,7 @@ for m in ('multiprocessing', 'billiard'):
         pass
 
 from setuptools import setup, find_packages
+import sys
 
 dev_requires = [
     'flake8>=1.6,<2.0',
Don't forget to import sys.