radius logging

my users are authenticating against AD that means samba+winbind. In my radius log I see login ok but logs as Domain\\username how can I change this so only Login OK: [testuser] from client ....... ---radius.log Aug 28 16:00:05 server1 radiusd[26044]: Login OK: [BILL\\testuser] (from client 192.168.1.1 port 1 cli bb1855t4vv68 via TLS tunnel) Aug 28 16:00:05 server1 radiusd[26044]: Login OK: [BILL\\testuser] (from client 192.168.1.1. port 1 cli bb1855t4vv68)