diff --git a/setup.py b/setup.py
index 074c186..84a0b4e 100644
--- a/setup.py
+++ b/setup.py
@@ -91,8 +91,6 @@ def parse_version(path):
         'Topic :: Scientific/Engineering :: Astronomy',
         'Topic :: Scientific/Engineering :: Physics',
         'Operating System :: Unix',
-        'Operating System :: MacOS',
-        'Operating System :: Windows',
         'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
     ],
 )