diff --git a/ansible/roles/ironic-enrolment/tasks/node.yml b/ansible/roles/ironic-enrolment/tasks/node.yml
index 6a30ef6..3290b15 100644
--- a/ansible/roles/ironic-enrolment/tasks/node.yml
+++ b/ansible/roles/ironic-enrolment/tasks/node.yml
@@ -102,6 +102,11 @@
           cpus: "{{ node.vcpus }}"
           memory_mb: "{{ node.memory_mb }}"
           local_gb: "{{ node.volumes[0].capacity | size_string_to_gb if node.volumes | length > 0 else 0 }}"
+          # Since we currently only support legacy BIOS boot mode, set it
+          # explicitly here. This is especially important since Ironic changed
+          # the default boot mode to UEFI in Yoga. If the capabilities field is
+          # provided, the boot_mode should be set explicitly.
+          capabilities: "boot_mode:bios"
 
     - name: Add Ironic node traits
       command: >-