diff -r 779e3d9b7a1d -r 3a72c89a83ec mercurial/commands.py
--- a/mercurial/commands.py	Thu Apr 11 13:30:31 2013 -0700
+++ b/mercurial/commands.py	Fri Feb 08 21:08:34 2013 +0000
@@ -1315,8 +1315,6 @@
         old = repo['.']
         if old.phase() == phases.public:
             raise util.Abort(_('cannot amend public changesets'))
-        if len(old.parents()) > 1:
-            raise util.Abort(_('cannot amend merge changesets'))
         if len(repo[None].parents()) > 1:
             raise util.Abort(_('cannot amend while merging'))
         if (not obsolete._enabled) and old.children():