diff --git a/roles/ceph-common/templates/ceph.conf.j2 b/roles/ceph-common/templates/ceph.conf.j2
index 520e1a1c0..113e738c3 100644
--- a/roles/ceph-common/templates/ceph.conf.j2
+++ b/roles/ceph-common/templates/ceph.conf.j2
@@ -99,7 +99,7 @@ host = {{ hostvars[host]['ansible_fqdn'] }}
 [mon.{{ hostvars[host]['ansible_hostname'] }}]
 host = {{ hostvars[host]['ansible_hostname'] }}
 {% endif %}
-{% if hostvars[host]['monitor_interface'] != "interface" %}
+{% if hostvars[host]['monitor_interface'] is defined and hostvars[host]['monitor_interface'] != "interface" %}
 {% include 'mon_addr_interface.j2' %}
 {% else %}
 {% include 'mon_addr_address.j2' %}