--- a/mercurial/commands.py	Fri Dec 21 22:58:59 2012 +0100
+++ b/mercurial/commands.py	Mon Dec 31 17:44:18 2012 -0600
@@ -1296,7 +1296,7 @@
             raise util.Abort(_('cannot amend merge changesets'))
         if len(repo[None].parents()) > 1:
             raise util.Abort(_('cannot amend while merging'))
-        if old.children():
+        if (not obsolete._enabled) and old.children():
             raise util.Abort(_('cannot amend changeset with children'))
 
         e = cmdutil.commiteditor