diff --git a/mercurial/changelog.py b/mercurial/changelog.py
--- a/mercurial/changelog.py
+++ b/mercurial/changelog.py
@@ -637,6 +637,9 @@
         if extra is None and any(x is not None for x in extrasentries):
             extra = {}
         sortedfiles = sorted(files)
+        if extra is not None:
+            for name in ('p1copies', 'p2copies', 'filesadded', 'filesremoved'):
+                extra.pop(name, None)
         if p1copies is not None:
             extra['p1copies'] = encodecopies(sortedfiles, p1copies)
         if p2copies is not None:
diff --git a/tests/test-copies-in-changeset.t b/tests/test-copies-in-changeset.t
--- a/tests/test-copies-in-changeset.t
+++ b/tests/test-copies-in-changeset.t
@@ -140,11 +140,7 @@
   saved backup bundle to $TESTTMP/repo/.hg/strip-backup/dd7bb9581359-a6e6b6d2-amend.hg
   $ hg changesetcopies
   files: j
-  filesadded: 0
-  filesremoved: 
   
-  p1copies: 0\x00a (esc)
-  p2copies: 
   $ hg showcopies --config experimental.copies.read-from=filelog-only
   a -> j
 The entries should be written to extras even if they're empty (so the client