How to change "++[files] returns noop " into "++[files] returns reject"

Hi all, in the section "authorize" I include the module "file". (/etc/raddb/users) At the moment I get an noop if a user is not found in the file. How can I change it to return a reject, if a user is not found? Now: ++[files] returns noop Destination: ++[files] returns reject Thanks in advance, Thomas