diff --git a/group_vars/all/vars.yml b/group_vars/all/vars.yml
index 1ab7396..5333be2 100644
--- a/group_vars/all/vars.yml
+++ b/group_vars/all/vars.yml
@@ -38,7 +38,7 @@ global_public_key_directory: "public_keys"
 global_dns_list_directory: "{{ global_public_key_directory }}/dns"
 global_dns_session_key_name: "local-ddns"
 global_dns_session_key_path: "/var/run/named/session.key"
-global_dns_session_key_algorithm: "{{ global_dns_update_key_algorithm }}"
+global_dns_session_key_algorithm: "hmac-sha512"
 global_dns_update_key_algorithm: "ED25519"
 global_dns_ttl: "{{ 24 * 60 * 60 }}" # default if omitted in all cases