diff --git a/tests/templates/globals-default.j2 b/tests/templates/globals-default.j2
index 4d8639a972..fe11a30e07 100644
--- a/tests/templates/globals-default.j2
+++ b/tests/templates/globals-default.j2
@@ -19,6 +19,10 @@ docker_custom_config:
 # in the CI gate.
 keepalived_virtual_router_id: "{{ 250 | random(1) }}"
 
+# MariaDB/Galera - fine tune gmcast.peer_timeout
+mariadb_wsrep_extra_provider_options:
+  - "gmcast.peer_timeout=PT15S"
+
 enable_openstack_core: "{{ openstack_core_enabled }}"
 enable_horizon: "{{ dashboard_enabled }}"
 enable_heat: "{{ openstack_core_tested }}"