Commit Fails on MAC Address change

I'm trying to change my MAC address, but getting a failure every time I try to commit:

admin@ERPOE:~$ configure
[edit]
admin@ERPOE# set interfaces ethernet eth4 mac 01:23:45:67:89:10
[edit]
admin@ERPOE# commit
[ interfaces ethernet eth4 ]
Failed to set MAC address

Commit failed
[edit]
admin@ERPOE#

Happens whether interface is enabled or disabled. I tried upgrade to 1.9 and rebooting.

Any ideas?