There is a round about way to do this by demoting the admin into a constituent record and then using that record to recreate the admin:
  1. Go to the admin record and on "Profile" tab click on "Remove Admin Status".
  2. Select "Not an Adminstrator" from the drop down and click on "Confirm permanent change".
  3. From the "Groups" tab remove the now constituent record from any admin groups keeping track of which groups the admin was in.
  4. From the "Profile" tab click on "Create As Admin" and follow the on screen prompts.