diff --git a/tests/functional/rgw-multisite/container/group_vars/all b/tests/functional/rgw-multisite/container/group_vars/all
index de25f6524..f60231934 100644
--- a/tests/functional/rgw-multisite/container/group_vars/all
+++ b/tests/functional/rgw-multisite/container/group_vars/all
@@ -24,6 +24,7 @@ os_tuning_params:
 ceph_conf_overrides:
   global:
     osd_pool_default_size: 1
+    mon_max_pg_per_osd: 512
 dashboard_enabled: False
 ceph_docker_registry: quay.ceph.io
 ceph_docker_image: ceph-ci/daemon
diff --git a/tests/functional/rgw-multisite/container/secondary/group_vars/all b/tests/functional/rgw-multisite/container/secondary/group_vars/all
index fa31f3fe7..8b118a178 100644
--- a/tests/functional/rgw-multisite/container/secondary/group_vars/all
+++ b/tests/functional/rgw-multisite/container/secondary/group_vars/all
@@ -24,6 +24,7 @@ os_tuning_params:
 ceph_conf_overrides:
   global:
     osd_pool_default_size: 1
+    mon_max_pg_per_osd: 512
 dashboard_enabled: False
 ceph_docker_registry: quay.ceph.io
 ceph_docker_image: ceph-ci/daemon
diff --git a/tests/functional/rgw-multisite/group_vars/all b/tests/functional/rgw-multisite/group_vars/all
index 91b54e052..9ad488a0b 100644
--- a/tests/functional/rgw-multisite/group_vars/all
+++ b/tests/functional/rgw-multisite/group_vars/all
@@ -22,4 +22,5 @@ os_tuning_params:
 ceph_conf_overrides:
   global:
     osd_pool_default_size: 1
+    mon_max_pg_per_osd: 512
 dashboard_enabled: False
diff --git a/tests/functional/rgw-multisite/secondary/group_vars/all b/tests/functional/rgw-multisite/secondary/group_vars/all
index d9b0e1e8d..97f8440dc 100644
--- a/tests/functional/rgw-multisite/secondary/group_vars/all
+++ b/tests/functional/rgw-multisite/secondary/group_vars/all
@@ -22,4 +22,5 @@ os_tuning_params:
 ceph_conf_overrides:
   global:
     osd_pool_default_size: 1
+    mon_max_pg_per_osd: 512
 dashboard_enabled: False