How can I permanently change/fake the mac address in Manjaro

How can change the mac address permanently? With macchanger or ifconfig I can change temporarily the mac address but not permanently. When I change my mac address temporarily and connect to a network, the mac address set back to the permanently mac address. How can I change this?

https://wiki.archlinux.org/index.php/MAC_Address_Spoofing#systemd-networkd