diff --git a/src/datastore_mad/remotes/ceph/cp b/src/datastore_mad/remotes/ceph/cp
index 82a295138f..992dbc50b7 100755
--- a/src/datastore_mad/remotes/ceph/cp
+++ b/src/datastore_mad/remotes/ceph/cp
@@ -115,7 +115,7 @@ REGISTER_CMD=$(cat <<EOF
     set -e
 
     # create rbd
-    $QEMU_IMG convert -O rbd $TMP_DST rbd:$RBD_SOURCE
+    $QEMU_IMG convert $TMP_DST rbd:$RBD_SOURCE
 
     # remove original
     $RM -f $TMP_DST
diff --git a/src/datastore_mad/remotes/ceph/mkfs b/src/datastore_mad/remotes/ceph/mkfs
index e14404bf77..f58301544e 100755
--- a/src/datastore_mad/remotes/ceph/mkfs
+++ b/src/datastore_mad/remotes/ceph/mkfs
@@ -93,7 +93,7 @@ REGISTER_CMD=$(cat <<EOF
     $MKFS_CMD
 
     # create rbd
-    $QEMU_IMG convert -O rbd $TMP_DST rbd:$RBD_SOURCE
+    $QEMU_IMG convert $TMP_DST rbd:$RBD_SOURCE
 
     # remove original
     $RM -f $TMP_DST