--- a/hgext/largefiles/lfutil.py	Thu Oct 12 09:04:22 2017 -0700
+++ b/hgext/largefiles/lfutil.py	Thu Oct 12 23:34:34 2017 -0700
@@ -79,7 +79,7 @@
                         encoding.environ.get('APPDATA'))
         if appdata:
             return os.path.join(appdata, longname)
-    elif pycompat.sysplatform == 'darwin':
+    elif pycompat.isdarwin:
         home = encoding.environ.get('HOME')
         if home:
             return os.path.join(home, 'Library', 'Caches', longname)