diff --git a/setup.py b/setup.py
index 45cd950..3f5052d 100644
--- a/setup.py
+++ b/setup.py
@@ -16,6 +16,7 @@
     make test
 """
 # non-controversial imports
+import os
 from setuptools import setup, find_packages
 from setuptools.command.install import install
 from glob import glob