Duplicate MAC address, unable to detach NIC

When I added a NIC to my virtual machine, the MAC address of the existing NIC was duplicated. Now, I’m not able to detach the NIC. I get the following error: detach_nic: Command “virsh --connect qemu:///system detach-interface --domain one-46 --type bridge --mac 02:00:c0:a8:2e:d2” failed: error: Domain has multiple interfaces matching MAC address 02:00:c0:a8:2e:d2. You must use detach-device and specify the device pci address to remove it.

I’ve tried the suggested command “detach-device”. That seemed to work, but I still see the two NICs in sunstone. Any ideas how I can fix this?