diff --git a/modules/04-install-brew.sh b/modules/04-install-brew.sh
index 6cc860d..6dce8a9 100755
--- a/modules/04-install-brew.sh
+++ b/modules/04-install-brew.sh
@@ -42,12 +42,11 @@ function ensureUserCanNoLongerRunPasswordlessSudo() {
 }
 
 function getFirstFreeRoleAccountID() {
-	local minUserID=450
-	local maxUserID=499
-	local uname_machine=$(/usr/bin/uname -m)
-	if [[ ${uname_machine} != "arm64" ]]; then
-		minUserID=200
-		maxUserID=400
+	local minUserID=200
+	local maxUserID=400
+	if is-at-least 13.0 $(sw_vers -productVersion); then
+		minUserID=450
+		maxUserID=499
 	fi
 	dscl . -list '/Users' UniqueID | grep '_.*' | sort -n -k2 | awk -v i=${minUserID} '$2>='${minUserID}' && $2<'${maxUserID}' {if(i < $2) { print i; nextfile} else i=$2+1;} END {if(i <= '${maxUserID}' && ($2 < '${minUserID}' || $2 > '${maxUserID}')) print i;}'
 }
@@ -356,6 +355,7 @@ function getUsage() {
 
 if [[ "${ZSH_EVAL_CONTEXT}" == toplevel ]]; then
 	test -f "${ASTZWEIG_MACOS_SYSTEM_LIB}" || { echo 'This module requires macos-system library. Please run again with macos-system library provieded as a path in ASTZWEIG_MACOS_SYSTEM_LIB env variable.'; return 10 }
+	autoload is-at-least
 	source "${ASTZWEIG_MACOS_SYSTEM_LIB}"
 	module_main $0 "$@"
 fi