How to do a Bulk Update on defects to assign the defects to the creator?

Hi,

I regularly use the bulk update feature to make changes to defects. But what I have not figured out is a way to assign the defects back to the users who created it. Is there a way to make this update in one go on the defects created by multiple users? Basically assign it to the same value as in "User Name".

thanks for your help in advance.

regards