diff --git a/tests/functional/centos/7/cluster/ceph-override.json b/tests/functional/centos/7/cluster/ceph-override.json
index 5a3999634..b2d765be5 100644
--- a/tests/functional/centos/7/cluster/ceph-override.json
+++ b/tests/functional/centos/7/cluster/ceph-override.json
@@ -4,6 +4,7 @@
 			"osd_pool_default_pg_num": 12,
 			"osd_pool_default_size": 1
 		}
-	}
-  "ceph_docker_image_tag": "tag-stable-3.0-luminous-ubuntu-16.04"
+	},
+  "ceph_docker_image_tag": "tag-stable-3.0-luminous-ubuntu-16.04",
+  "ceph_mon_docker_memory_limit": "2g"
 }