diff --git a/src/datastore_mad/remotes/vmfs/clone b/src/datastore_mad/remotes/vmfs/clone
index 7411a4bf82..d11501aad7 100755
--- a/src/datastore_mad/remotes/vmfs/clone
+++ b/src/datastore_mad/remotes/vmfs/clone
@@ -103,7 +103,7 @@ if ! is_cdrom; then
     exec_and_log "ssh_make_path $DST_HOST $DST" \
                  "Cannot create $DST in $DST_HOST"
 
-    if [ -n $CLONE_FSTYPE ]; then
+    if [ ! -z $CLONE_FSTYPE ]; then
         CLONE_FSTYPE="-d $CLONE_FSTYPE"
     fi