proftd + mysql = case sensitive auth?
 

Hi!
A couple of months ago I started using mysql to authenticate my
proftpd logins, works fine.
But one thing that annoy me, when authenticating against mysql, I cant get my logins to be case sensitive. If I login as User or usEr doesn´t matter, works any way.
Does any one have any idéa? My guess is that I have to change something in my sql to get my logins case sensitive.