using the user() function in a trigger/replication scenario

[Steve DeWitt]

we have a trigger evalutes the user() function. We connect to the master as user A and this evaluates to A@someipaddress_hostname. When this makes it to the slave it evaluates to root@someipaddress or root@localhost. The syntax in the trigger is

if locate('A',user()) = 0 then
#do some stuff here
end if;

How can I make the trigger behave the same on the slave as it does on the master?