mercurial/hgweb/server.py

--- a/mercurial/hgweb/server.py	Thu Oct 12 19:20:04 2017 -0700
+++ b/mercurial/hgweb/server.py	Thu Oct 12 23:30:46 2017 -0700
@@ -266,7 +266,7 @@
 class MercurialHTTPServer(_mixin, httpservermod.httpserver, object):
 
     # SO_REUSEADDR has broken semantics on windows
-    if pycompat.osname == 'nt':
+    if pycompat.iswindows:
         allow_reuse_address = 0
 
     def __init__(self, ui, app, addr, handler, **kwargs):