--- a/mercurial/changelog.py	Fri Feb 19 10:53:27 2021 +0100
+++ b/mercurial/changelog.py	Wed Mar 10 19:33:18 2021 +0100
@@ -428,6 +428,7 @@
         self._filteredrevs = frozenset()
         self._filteredrevs_hashcache = {}
         self._copiesstorage = opener.options.get(b'copies-storage')
+        self.revlog_kind = b'changelog'
 
     @property
     def filteredrevs(self):