diff --git a/setup.cfg b/setup.cfg
index d976fa7..50c143a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,7 +17,6 @@ keywords =
     ctp
 classifiers =
     Development Status :: 5 - Production/Stable
-    Operating System :: Microsoft :: Windows
     Operating System :: POSIX :: Linux
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.7