diff --git a/tripleo_ansible/roles/tripleo-ssh-known-hosts/tasks/main.yml b/tripleo_ansible/roles/tripleo-ssh-known-hosts/tasks/main.yml
index aa85a5269..927e31fe6 100644
--- a/tripleo_ansible/roles/tripleo-ssh-known-hosts/tasks/main.yml
+++ b/tripleo_ansible/roles/tripleo-ssh-known-hosts/tasks/main.yml
@@ -48,13 +48,15 @@
       set_fact:
         ssh_known_hosts_lines: |-
           {%- for host in groups['overcloud'] | intersect(play_hosts) %}
-          [{{ ctlplane_ip }}]*,[{{ host }}.{{ cloud_domain }}]*,[{{ host }}]*{%- if enabled_networks | length > 0 %},{% endif %}
+          [{{ ctlplane_ip }}]*,[{{ host }}.{{ cloud_domain }}]*,[{{ host }}]*
+          {%- if enabled_networks | length > 0 and role_networks and role_networks | length > 0 %},
           {%- for network in enabled_networks %}
           {%- if network in role_networks %}
           [{{ hostvars[host][networks[network]['name'] ~ '_ip'] }}]*,[{{ host }}.{{ networks[network]['name'] }}]*,{% if 1 %}{% endif %}
           [{{ host }}.{{ networks[network]['name'] }}.{{ cloud_domain }}]*{% if not loop.last %},{% endif %}
           {%- endif -%}
           {%- endfor -%}
+          {%- endif -%}
           {{ ' ssh-rsa ' ~ hostvars[host]['ansible_ssh_host_key_rsa_public'] }}
           {% endfor %}