diff --git a/packcheck.sh b/packcheck.sh
index 1a061a0..0cdefc2 100755
--- a/packcheck.sh
+++ b/packcheck.sh
@@ -911,6 +911,7 @@ ghcup_install() {
     case "$os" in
       "Linux x86_64") GHCUP_ARCH="x86_64-linux" ;;
       "Darwin x86_64") GHCUP_ARCH="x86_64-apple-darwin" ;;
+      "Darwin arm64") GHCUP_ARCH="aarch64-apple-darwin" ;;
       *) echo "Unknown OS/Arch: $os"; exit 1;;
     esac