diff --git a/usr/bin/archboot-update-installer.sh b/usr/bin/archboot-update-installer.sh
index d49df8ea2..0e700a293 100755
--- a/usr/bin/archboot-update-installer.sh
+++ b/usr/bin/archboot-update-installer.sh
@@ -27,8 +27,8 @@ kver() {
 
 zram_mount() {
     # add defaults
-    [[ -z "${_ZRAM_ALGORITHM}" ]] && _ZRAM_ALGORITHM="zstd"
-    [[ -z "${_ZRAM_MAX_COMP_STREAMS}" ]] && _ZRAM_MAX_COMP_STREAMS="4"
+    _ZRAM_ALGORITHM=${_ZRAM_ALGORITHM:-"zstd"}
+    _ZRAM_MAX_COMP_STREAMS=${_ZRAM_MAX_COMP_STREAMS:-"4"}
     modprobe zram
     echo "${_ZRAM_ALGORITHM}" >/sys/block/zram0/comp_algorithm
     echo "${1}" >/sys/block/zram0/disksize
@@ -137,7 +137,7 @@ if [[ "${_L_COMPLETE}" == "1" || "${_L_INSTALL_COMPLETE}" == "1" ]]; then
         exit 1
     fi
     touch /.update-installer
-    [[ -z "${_ZRAM_SIZE}" ]] && _ZRAM_SIZE="3G"
+    _ZRAM_SIZE=${_ZRAM_SIZE:-"3G"}
     zram_mount "${_ZRAM_SIZE}"
     echo -e "\033[1mStep 1/9:\033[0m Removing not necessary files from / ..."
     clean_archboot
@@ -226,7 +226,7 @@ fi
 
 # Generate new images
 if [[ "${_G_RELEASE}" == "1" ]]; then
-    [[ -z "${_ZRAM_IMAGE_SIZE}" ]] && _ZRAM_IMAGE_SIZE="5G"
+    _ZRAM_IMAGE_SIZE=${_ZRAM_IMAGE_SIZE:-"5G"}
     zram_mount "${_ZRAM_IMAGE_SIZE}"
     echo -e "\033[1mStep 1/2:\033[0m Removing not necessary files from / ..."
     clean_archboot