diff -r 238abf65a8ad -r dacfcdd8b94e hgext/fsmonitor/__init__.py
--- a/hgext/fsmonitor/__init__.py	Thu Oct 12 09:04:22 2017 -0700
+++ b/hgext/fsmonitor/__init__.py	Thu Oct 12 23:34:34 2017 -0700
@@ -603,7 +603,7 @@
 def extsetup(ui):
     extensions.wrapfilecache(
         localrepo.localrepository, 'dirstate', wrapdirstate)
-    if pycompat.sysplatform == 'darwin':
+    if pycompat.isdarwin:
         # An assist for avoiding the dangling-symlink fsevents bug
         extensions.wrapfunction(os, 'symlink', wrapsymlink)