diff --git a/roles/base/templates/etc/ssh/ssh_known_hosts.j2 b/roles/base/templates/etc/ssh/ssh_known_hosts.j2
index b17201d..b773dd3 100644
--- a/roles/base/templates/etc/ssh/ssh_known_hosts.j2
+++ b/roles/base/templates/etc/ssh/ssh_known_hosts.j2
@@ -2,5 +2,7 @@
 # {{ ansible_managed }}
 
 {% for host in groups[cluster_group] %}
+{% if hostvars[host].ansible_ssh_host_key_ed25519_public is defined %}
 {{ host }},{{ host.split('.')[0] }}.{{ networks['cluster']['domain'] }},{{ host.split('.')[0] }} ssh-ed25519 {{ hostvars[host].ansible_ssh_host_key_ed25519_public }}
+{% endif %}
 {% endfor %}