Can't create timer because TARGETID column is too small

I tried using the timer service in JBoss 4 for the first time today and the timer creation failed because the TARGETID column is defined as VARCHAR(80), and the code is trying to insert a value that is 88 chars long:

target=jboss.j2ee:jndiName=com/hmsonline/harvester/control/client/Scheduler,service=EJB

Can you just increase the column size to something like 255 chars by default?