mutt: ask for confirmation before moving message to archive

I have following macro defined in my muttrc: macro index s ":set confirmappend=no delete=yes auto_tag=yes\n\ =archive\n:set delete=ask-yes\n" When I press s on a message, it will immediately be moved into my archive folder. I would like to modify my macro, so that I will be asked for confirmation before the message is moved. But when I change confirmappend=yes: macro index s ":set confirmappend=yes delete=yes auto_tag=yes\n\ =archive\n:set delete=ask-yes\n" and when I press s, mutt becomes immediately unresponsive, all keys stop working, I cannot even exit. The cpu runs at 100% and I have to log in from another console to kill mutt. Can somebody please advise how to correctly modify my macro?