diff --git a/sd_fuse/sd_fusing.sh b/sd_fuse/sd_fusing.sh
index 451013f1198..ac1921c3937 100755
--- a/sd_fuse/sd_fusing.sh
+++ b/sd_fuse/sd_fusing.sh
@@ -7,17 +7,17 @@
 #
 
 abort() {
-	echo $1
+	echo "$1"
 	exit 1
 }
 
-[ -z $1 ] && abort "usage: $0 <your/memory/card/device>"
-[ -z ${UBOOT} ] && UBOOT=${PWD}/u-boot.bin
-[ ! -f ${UBOOT} ] && abort "error: ${UBOOT} is not exist"
+[ -z "$1" ] && abort "usage: $0 <your/memory/card/device>"
+[ -z "${UBOOT}" ] && UBOOT=${PWD}/u-boot.bin
+[ ! -f "${UBOOT}" ] && abort "error: ${UBOOT} is not exist"
 
-sudo dd if=$UBOOT of=$1 conv=fsync,notrunc bs=512 seek=1
+sudo dd if="$UBOOT" of="$1" conv=fsync,notrunc bs=512 seek=1
 
 sync
 
-sudo eject $1
+sudo eject "$1"
 echo Finished.