diff --git a/ceph/find-osd-device.sh b/ceph/find-osd-device.sh
index 9572e6c..52f8c7e 100755
--- a/ceph/find-osd-device.sh
+++ b/ceph/find-osd-device.sh
@@ -15,7 +15,7 @@ osd_path=/var/lib/ceph/osd/ceph-${osdid}
 
 mountpath=$(mount | grep "on ${osd_path} ")
 
-if [ -z ${mountpath} ]; then
+if [ -z "${mountpath}" ]; then
     echo "Nothing mounted on ${osd_path}, are you on the right host?"
     exit 1
 fi