diff --git a/data/system/boot/InstallerFinishScript b/data/system/boot/InstallerFinishScript
index a551106a92..6e52cc7844 100644
--- a/data/system/boot/InstallerFinishScript
+++ b/data/system/boot/InstallerFinishScript
@@ -3,12 +3,12 @@
 
 mount=$1
 
-if [ -z $mount ]; then
+if [ -z "$mount" ]; then
 	echo "Usage: $0 volume"
 	exit 1
 fi
 
-if [ ! -d $mount ]; then
+if [ ! -d "$mount" ]; then
 	echo "$mount isn't mounted"
 	exit 1
 fi