diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -2623,11 +2623,6 @@ def amend(ui, repo, commitfunc, old, ext
                 message = old.description()
 
             pureextra = extra.copy()
-            if 'amend_source' in pureextra:
-                del pureextra['amend_source']
-            pureoldextra = old.extra()
-            if 'amend_source' in pureoldextra:
-                del pureoldextra['amend_source']
             extra['amend_source'] = old.hex()
 
             new = context.memctx(repo,
@@ -2645,7 +2640,7 @@ def amend(ui, repo, commitfunc, old, ext
                 and newdesc == old.description()
                 and user == old.user()
                 and date == old.date()
-                and pureextra == pureoldextra):
+                and pureextra == old.extra()):
                 # nothing changed. continuing here would create a new node
                 # anyway because of the amend_source noise.
                 #
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -1682,9 +1682,6 @@ def _docommit(ui, repo, *pats, **opts):
         if not allowunstable and old.children():
             raise error.Abort(_('cannot amend changeset with children'))
 
-        newextra = extra.copy()
-        newextra['branch'] = branch
-        extra = newextra
         # commitfunc is used only for temporary amend commit by cmdutil.amend
         def commitfunc(ui, repo, message, match, opts):
             return repo.commit(message,