diff --git a/setup.py b/setup.py
index 412eaa2f60b4c81f0f7a94ae9db686ce03dd7484..b6062bd5f8799dedd00dc152ba58352f73e456f4 100644
--- a/setup.py
+++ b/setup.py
@@ -10,6 +10,8 @@ dist.Distribution(dict(setup_requires=['bob.blitz'] + bob_packages))
 from bob.extension.utils import egrep, find_header, find_library
 from bob.blitz.extension import Extension, Library, build_ext
 
+import os
+
 packages = ['boost']
 boost_modules = ['system', 'filesystem']