smartd invalid checksum messages

I am getting messages on many machines running smartd in syslog saying

smartd[22921]: Warning! SMART ATA Error Log Structure error: invalid 
SMART checksum.

Looking through the doc, smartctl has an option (-bignore) to turn this 
check off.  However, I could not find a way to tell smartd to ignore it.

Is this possible ? Some admins get concerned because the message appears 
to be a serious problem.

(Running smartmontools 5.33 on RedHat 3 or 4)

Tim

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