diff --git a/Lib/test/test_selectors.py b/Lib/test/test_selectors.py
index 68e2b991ec7..34edd7630dd 100644
--- a/Lib/test/test_selectors.py
+++ b/Lib/test/test_selectors.py
@@ -109,7 +109,7 @@ def test_unregister_after_fd_close(self):
         s.unregister(r)
         s.unregister(w)
 
-    @unittest.skipUnless(hasattr(os, 'dup2'), "need os.dup2()")
+    @unittest.skipUnless(os.name == 'posix', "requires posix")
     def test_unregister_after_fd_close_and_reuse(self):
         s = self.SELECTOR()
         self.addCleanup(s.close)