diff -r 4c041c71ec01 -r 64cd1496bb70 mercurial/metadata.py
--- a/mercurial/metadata.py	Tue Apr 06 05:20:24 2021 +0200
+++ b/mercurial/metadata.py	Thu Apr 08 19:00:21 2021 +0200
@@ -20,6 +20,7 @@
 )
 
 from .revlogutils import (
+    constants as revlogconst,
     flagutil as sidedataflag,
     sidedata as sidedatamod,
 )
@@ -826,7 +827,7 @@
     if requirementsmod.COPIESSDC_REQUIREMENT in repo.requirements:
         repo.register_wanted_sidedata(sidedatamod.SD_FILES)
         repo.register_sidedata_computer(
-            b"changelog",
+            revlogconst.KIND_CHANGELOG,
             sidedatamod.SD_FILES,
             (sidedatamod.SD_FILES,),
             copies_sidedata_computer,