diff --git a/src/Validation/Validation.php b/src/Validation/Validation.php
index 615e0f2b9e9..06a6c5f6fe9 100644
--- a/src/Validation/Validation.php
+++ b/src/Validation/Validation.php
@@ -172,7 +172,7 @@ public static function cc($check, $type = 'fast', $deep = false, $regex = null)
         }
         $cards = [
             'all' => [
-                'amex' => '/^3[4|7]\\d{13}$/',
+                'amex' => '/^3[47]\\d{13}$/',
                 'bankcard' => '/^56(10\\d\\d|022[1-5])\\d{10}$/',
                 'diners' => '/^(?:3(0[0-5]|[68]\\d)\\d{11})|(?:5[1-5]\\d{14})$/',
                 'disc' => '/^(?:6011|650\\d)\\d{12}$/',