diff --git a/season_test.php b/season_test.php
index 6e8a450..d697530 100644
--- a/season_test.php
+++ b/season_test.php
@@ -2,6 +2,8 @@
 
 require 'season.php';
 
+php_sapi_name() == 'cli' || die('Forbidden');
+
 $jz = new Season();
 for ($j = 2000; $j < 2100; $j++) {
 	$jz->calc($j);