diff --git a/setup.py b/setup.py
index 2cf4a74..1b710ea 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,6 @@ def get_version(filename):
         'Intended Audience :: Developers',
         'License :: OSI Approved :: BSD License',
         'Operating System :: POSIX',
-        'Operating System :: Microsoft :: Windows',
         'Operating System :: MacOS :: MacOS X',
         'Topic :: Software Development :: Testing',
         'Topic :: Software Development :: Libraries',