diff --git a/ceph-osd-activate-all b/ceph-osd-activate-all
index 713a311..bd9a340 100755
--- a/ceph-osd-activate-all
+++ b/ceph-osd-activate-all
@@ -10,6 +10,10 @@ tmpdir=$(mktemp -d)
 for dev in $(fdisk -l | awk '$6 ~/Ceph/ { print $1 }'); do
     mount "$dev" "$tmpdir"
     id=$(cat "${tmpdir}/whoami")
+
+    # Chown the dev device to be accessible for ceph
+    chown ceph:ceph "${tmpdir}/block
+
     umount "$dev"
 
     dir="/var/lib/ceph/osd/ceph-$id"