diff --git a/hgext3rd/treedirstate.py b/hgext3rd/treedirstate.py
--- a/hgext3rd/treedirstate.py
+++ b/hgext3rd/treedirstate.py
@@ -384,6 +384,7 @@
                 return None
         return _overlaydict(lookup)
 
+    @property
     def identity(self):
         if self._identity is None:
             self.read()