diff --git a/metal/roles/pxe-boot/templates/tftp/tftpboot/grub.cfg.j2 b/metal/roles/pxe-boot/templates/tftp/tftpboot/grub.cfg.j2
index 611afc86..6a79aa9b 100644
--- a/metal/roles/pxe-boot/templates/tftp/tftpboot/grub.cfg.j2
+++ b/metal/roles/pxe-boot/templates/tftp/tftpboot/grub.cfg.j2
@@ -6,6 +6,6 @@ menuentry '{{ os_name }} (Live)' {
         ignition.platform.id=metal \
         coreos.live.rootfs_url=http://{{ ansible_default_ipv4.address }}/{{ os_name }}/images/pxeboot/rootfs.img \
         coreos.inst.install_dev=/dev/{{ disk }} \
-        coreos.inst.ignition_url=http://{{ ansible_default_ipv4.address }}/ignition/ignition.json
+        coreos.inst.ignition_url=http://{{ ansible_default_ipv4.address }}/ignition/${net_default_mac}.json
     initrd initrd.img ignition.img
 }