diff --git a/etc/kayobe/seed-vm.yml b/etc/kayobe/seed-vm.yml
index 1617b9a..472bc21 100644
--- a/etc/kayobe/seed-vm.yml
+++ b/etc/kayobe/seed-vm.yml
@@ -63,6 +63,9 @@ seed_vm_vcpus: 1
 #
 #seed_vm_interfaces:
 
+# Boot firmware - 'efi' or 'bios' - with latter being the default
+seed_vm_boot_firmware: efi
+
 ###############################################################################
 # Dummy variable to allow Ansible to accept this file.
 workaround_ansible_issue_8743: yes
diff --git a/tenks-compute.yml b/tenks-compute.yml
index 081899a..670a76b 100644
--- a/tenks-compute.yml
+++ b/tenks-compute.yml
@@ -23,6 +23,8 @@ ipmi_address: 192.168.33.4
 
 ipmi_port_range_start: 6238
 
+default_boot_mode: uefi
+
 nova_flavors:
   - resource_class: test-rc
     node_type: baremetal-compute
diff --git a/tenks-storage.yml b/tenks-storage.yml
index 8b14e3c..3106e63 100644
--- a/tenks-storage.yml
+++ b/tenks-storage.yml
@@ -25,6 +25,8 @@ specs:
 
 ipmi_address: 192.168.33.4
 
+default_boot_mode: uefi
+
 nova_flavors: []
 
 physnet_mappings:
diff --git a/tenks.yml b/tenks.yml
index a209b63..37ad51f 100644
--- a/tenks.yml
+++ b/tenks.yml
@@ -40,6 +40,8 @@ specs:
 
 ipmi_address: 192.168.33.4
 
+default_boot_mode: uefi
+
 nova_flavors: []
 
 physnet_mappings: