diff --git a/scripts/ceph/start.sh b/scripts/ceph/start.sh
index 0a5903d37..a4c089e00 100755
--- a/scripts/ceph/start.sh
+++ b/scripts/ceph/start.sh
@@ -136,6 +136,10 @@ ceph-osd -c ${ceph_conf} -i $i --mkfs --mkkey --osd-uuid ${uuid} ${ceph_osd_extr
 ceph -c ${ceph_conf} osd crush add osd.${i} 1.0 host=$(hostname) root=default
 ceph -c ${ceph_conf} -i ${mnt_dir}/osd-device-${i}-data/keyring auth add osd.${i} osd "allow *" mon "allow profile osd" mgr "allow *"
 
+class_dir=/$(ceph -c "$ceph_conf" config get osd osd_class_dir)
+[[ -e $class_dir ]]
+ceph -c "$ceph_conf" config set osd osd_class_dir "$class_dir"
+
 # start osd
 pkill -9 ceph-osd || true
 sleep 2