diff --git a/src/Basis.php b/src/Basis.php
index d590724..287f2f2 100644
--- a/src/Basis.php
+++ b/src/Basis.php
@@ -31,7 +31,6 @@ function isHost(string $host): bool { // IPv4 / IPv6 / Domain
 }
 
 function isPort(int $port): bool {
-    $port = intval($port);
     return ($port < 65536 and $port > 0);
 }
 
diff --git a/src/Check.php b/src/Check.php
index 6a81ec0..a7d46d7 100644
--- a/src/Check.php
+++ b/src/Check.php
@@ -67,6 +67,7 @@ function kmsCheckCli(string $host): void {
             exit;
         }
     }
+    $port = intval($port);
     if (!isPort($port)) {
         echo "Invalid port\n";
         exit;