diff --git a/post-install_Claude.sh b/post-install_Claude.sh
index 9c322c7..2d7830d 100644
--- a/post-install_Claude.sh
+++ b/post-install_Claude.sh
@@ -44,8 +44,9 @@ EOF
 check_prerequisites() {
     [[ $EUID -eq 0 ]] || die "Ce script doit être exécuté en root (sudo)."
     [[ -r /etc/debian_version ]] || die "Ce script est prévu pour Debian."
-    [[ $SSH_PORT =~ ^[0-9]+$ ]] && (( SSH_PORT >= 1 && SSH_PORT <= 65535 )) \
-        || die "Port SSH invalide : ${SSH_PORT}"
+    if ! [[ $SSH_PORT =~ ^[0-9]+$ ]] || (( SSH_PORT < 1 || SSH_PORT > 65535 )); then
+        die "Port SSH invalide : ${SSH_PORT}"
+    fi
 }
 
 # --- Étapes ---