diff --git a/roles/knotd/tasks/main.yml b/roles/knotd/tasks/main.yml
index 4e1948c..9e2ffec 100644
--- a/roles/knotd/tasks/main.yml
+++ b/roles/knotd/tasks/main.yml
@@ -32,7 +32,8 @@
     origin: "{{ item.key }}"
     soa:
       mname: "{{ item.value.soa.mname }}"
-      rname: "{{ item.value.soa.rname }}"
+      rname: "{{ item.value.soa.rname | default(knotd__soa_rname
+                                                | default(omit)) }}"
       refresh: "{{ item.value.soa.refresh | default(knotd__soa_refresh)
                    | community.general.to_seconds | int }}"
       retry: "{{ item.value.soa.retry | default(knotd__soa_retry)