VLAN Interface Mac Address Issue

[starkiller]

I have a Box that I am using with pfsense 2.1.5.
I am using VLAN's on the WAN port em0 & right now all vlan interfaces on em0 use em0's address.
When I change one of the vlan's mac addresses, it sets all the other vlan's on em0 addresses to the new mac.

How can i use a different mac for each vlan interface?