diff --git a/roles/ceph-rgw/tasks/main.yml b/roles/ceph-rgw/tasks/main.yml
index f3941b126..95f306e61 100644
--- a/roles/ceph-rgw/tasks/main.yml
+++ b/roles/ceph-rgw/tasks/main.yml
@@ -34,7 +34,7 @@
       run_once: true
 
     - name: customize pool size
-      command: "{{ docker_exec_cmd }} ceph --connect-timeout 5 --cluster {{ cluster }} osd pool set {{ item.key }} size {{ item.size | default(osd_pool_default_size) }}"
+      command: "{{ docker_exec_cmd }} ceph --connect-timeout 5 --cluster {{ cluster }} osd pool set {{ item.key }} size {{ item.value.size | default(osd_pool_default_size) }}"
       with_dict: "{{ rgw_create_pools }}"
       delegate_to: "{{ groups[mon_group_name][0] }}"
       changed_when: false