diff --git a/scripts/install/server.sh b/scripts/install/server.sh
index 2443786..ca63dea 100755
--- a/scripts/install/server.sh
+++ b/scripts/install/server.sh
@@ -3,6 +3,18 @@
 set -euo pipefail
 ORIG_USER=${SUDO_USER:-$(id -un)}
 
+REF=${LESAVKA_REF:-master}        # fallback
+
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    -r|--ref) REF="$2"; shift 2 ;;
+    -h|--help)
+      echo "Usage: $0 [--ref <branch|commit>]"; exit 0 ;;
+    *) echo "Unknown option: $1"; exit 1 ;;
+  esac
+done
+echo "==> Using git ref: $REF"
+
 echo "==> 1a. Base packages"
 sudo pacman -Syq --needed --noconfirm git \
                                       rustup \
@@ -86,6 +98,12 @@ if [[ -d $SRC_DIR/.git ]]; then
   sudo -u "$ORIG_USER" git -C "$SRC_DIR" pull --ff-only
 else
   sudo -u "$ORIG_USER" git clone "$REPO_URL" "$SRC_DIR"
+fip
+
+if sudo -u "$ORIG_USER" git -C "$SRC_DIR" rev-parse --verify --quiet "origin/$REF" >/dev/null; then
+  sudo -u "$ORIG_USER" git -C "$SRC_DIR" checkout -B "$REF" "origin/$REF"
+else
+  sudo -u "$ORIG_USER" git -C "$SRC_DIR" checkout --force "$REF"
 fi
 
 echo "==> 4b. Source build"