diff --git a/packages/bsp/common/usr/sbin/armbian-install b/packages/bsp/common/usr/sbin/armbian-install
index b43f78bf21..94194c6c97 100755
--- a/packages/bsp/common/usr/sbin/armbian-install
+++ b/packages/bsp/common/usr/sbin/armbian-install
@@ -857,12 +857,12 @@ main()
 			options+=(5 "Install/Update the bootloader on $rootchip (${root_partition_device})")
                 fi
 
-		if [ -n ${emmc_dev} ] && [ "${emmc_dev}" != "${root_partition_device}" ]; then
+		if [ -n "${emmc_dev}" ] && [ "${emmc_dev}" != "${root_partition_device}" ]; then
 
 			options+=(6 "Install/Update the bootloader on eMMC (${emmc_dev})")
 			BOOTPART=${emmc_dev}
 
-		elif [ -n ${sd_dev} ] && [ "${sd_dev}" != "${root_partition_device}" ]; then
+		elif [ -n "${sd_dev}" ] && [ "${sd_dev}" != "${root_partition_device}" ]; then
 
 			options+=(6 "Install/Update the bootloader on SD card (${sd_dev})")
 			BOOTPART=${sd_dev}