diff --git a/deployment/nova/nova-az-config.yaml b/deployment/nova/nova-az-config.yaml
index c4ff907502..b923c484f9 100644
--- a/deployment/nova/nova-az-config.yaml
+++ b/deployment/nova/nova-az-config.yaml
@@ -82,7 +82,7 @@ outputs:
           os_nova_host_aggregate:
             name: {get_attr: [NovaComputeAvailabilityZoneValue, value]}
             availability_zone: {get_attr: [NovaComputeAvailabilityZoneValue, value]}
-            hosts: "{{ groups['nova_compute'] | default([]) | map('extract', hostvars, 'nova_host') | list }}"
+            hosts: "{{ groups['nova_compute'] | default([]) | map('extract', hostvars, 'nova_host') | select('defined') | list }}"
             auth:
               username: admin
               password: {get_param: AdminPassword}