diff --git a/AvocadoEdition_Light/_extra_font.php b/AvocadoEdition_Light/_extra_font.php
index 3a0d1c9..086511f 100644
--- a/AvocadoEdition_Light/_extra_font.php
+++ b/AvocadoEdition_Light/_extra_font.php
@@ -1,5 +1,6 @@
 <?php
-include_once './_common.php';
+if (!defined('_GNUBOARD_'))
+  exit;
 
 $font_sql = "SELECT * FROM {$g5['font_table']} ORDER BY font_name ASC";
 $font_result = sql_query($font_sql);