diff --git a/scripts/update/update.sh b/scripts/update/update.sh
index a0c4d81..d3eeff5 100755
--- a/scripts/update/update.sh
+++ b/scripts/update/update.sh
@@ -8,16 +8,16 @@ distro="$(grep "^ID" /etc/*release | cut -d "=" -f2)"
 script="$(dirname $(realpath $0))/$distro.sh"
 
 # check if update script exists
-[[ ! -x "$script" ]] && printf "error: update script '"$script"' does not exist or is not executable!\n" >&2 && exit 1
+[ ! -x "$script" ] && printf "error: update script '"$script"' does not exist or is not executable!\n" >&2 && exit 1
 
 args=""
 for arg in "$@"; do
-	[[ -n "$args" ]] && args="$args "
+	[ -n "$args" ] && args="$args "
 	args="$args$arg"
 done
 
 # execute update script
-if [[ "$EUID" == "0" ]]; then
+if [ "$(id -u)" -eq 0 ]; then
 	"$script"  $args
 else
 	sudo "$script" $args