--- a/mercurial/changelog.py	Sat Sep 12 21:45:37 2020 +0900
+++ b/mercurial/changelog.py	Tue Sep 22 10:27:35 2020 +0200
@@ -570,7 +570,7 @@
         sortedfiles = sorted(files.touched)
         sidedata = None
         if self._copiesstorage == b'changeset-sidedata':
-            sidedata = metadata.encode_copies_sidedata(files)
+            sidedata = metadata.encode_files_sidedata(files)
 
         if extra:
             extra = encodeextra(extra)