diff --git a/ansible/roles/heat/templates/heat.conf.j2 b/ansible/roles/heat/templates/heat.conf.j2
index c21cb1a828..b9389e445a 100644
--- a/ansible/roles/heat/templates/heat.conf.j2
+++ b/ansible/roles/heat/templates/heat.conf.j2
@@ -14,7 +14,7 @@ stack_domain_admin_password = {{ heat_domain_admin_password }}
 stack_user_domain_name = heat_user_domain
 
 deferred_auth_method = trusts
-trusts_delegated_role = heat_stack_owner
+trusts_delegated_roles = heat_stack_owner
 num_engine_workers = {{ openstack_service_workers }}
 
 transport_url = rabbit://{% for host in groups['rabbitmq'] %}{{ rabbitmq_user }}:{{ rabbitmq_password }}@{% if orchestration_engine == 'KUBERNETES' %}rabbitmq{% else %}{{ hostvars[host]['ansible_' + hostvars[host]['api_interface']]['ipv4']['address'] }}{% endif %}:{{ rabbitmq_port }}{% if not loop.last %},{% endif %}{% endfor %}