diff --git a/ansible/roles/postgresql_server/templates/etc/postgresql/postgresql.conf.j2 b/ansible/roles/postgresql_server/templates/etc/postgresql/postgresql.conf.j2
index 7b9aa18ac4..8efe554ccc 100644
--- a/ansible/roles/postgresql_server/templates/etc/postgresql/postgresql.conf.j2
+++ b/ansible/roles/postgresql_server/templates/etc/postgresql/postgresql.conf.j2
@@ -76,7 +76,10 @@ password_encryption = {{ item.password_encryption | d('scram-sha-256') }}
 {% else %}
 password_encryption = {{ item.password_encryption | d('on') }}
 {% endif %}
+{% if (item.version | d(postgresql_server__version)) is version_compare('17','<') %}
 db_user_namespace = {{ item.db_user_namespace | d('off') }}
+{% endif %}
+
 
 
 # - Kerberos and GSSAPI -
@@ -243,7 +246,9 @@ max_replication_slots = {{ item.max_replication_slots | d('0') }}
 
 # These settings are ignored on a standby server
 synchronous_standby_names = '{{ item.synchronous_standby_names | d("") }}'
+{% if (item.version | d(postgresql_server__version)) is version_compare('16','<') %}
 vacuum_defer_cleanup_age = {{ item.vacuum_defer_cleanup_age | d('0') }}
+{% endif %}
 
 
 # - Standby Servers -