--- a/mercurial/commands.py	Tue Aug 19 14:33:01 2014 -0400
+++ b/mercurial/commands.py	Tue Aug 19 14:33:31 2014 -0400
@@ -1409,7 +1409,7 @@
             raise util.Abort(_('cannot amend with ui.commitsubrepos enabled'))
 
         old = repo['.']
-        if old.phase() == phases.public:
+        if not old.mutable():
             raise util.Abort(_('cannot amend public changesets'))
         if len(repo[None].parents()) > 1:
             raise util.Abort(_('cannot amend while merging'))