diff --git a/bash/mount.sh b/bash/mount.sh
index ca6ac45..ee14c83 100644
--- a/bash/mount.sh
+++ b/bash/mount.sh
@@ -1,7 +1,7 @@
 mo() {
 	local directory="${1}"
 	local file
-	if [ "${directory}" ] ; then
+	if [ -n "${directory}" ] ; then
 		directory="$(realpath "${directory}")"
 		file="${directory}/filesystem.squashfs"
 		if mkdir "overlay" ; then