diff --git a/hgext/fsmonitor/__init__.py b/hgext/fsmonitor/__init__.py
--- a/hgext/fsmonitor/__init__.py
+++ b/hgext/fsmonitor/__init__.py
@@ -251,7 +251,7 @@ def overridewalk(orig, self, match, subr
 
     matchfn = match.matchfn
     matchalways = match.always()
-    dmap = self._map
+    dmap = self._map._map
     nonnormalset = getattr(self, '_nonnormalset', None)
 
     copymap = self._map.copymap