message time-stamp missing (send from statisticsBrokerPlugin)

Hi

Messages send from statisticsBrokerPlugin to a destination do not have a
timestamp. (0 or 1970-01-01T01:00:00+01:00).

How can I force ActiveMQ to timestamp statistics messages send from
statisticsBrokerPlugin?

I am using python with stomp on ActiveMQ 5.9.0.

Thanks in advance.

Nader