diff --git a/bin/html2text.php b/bin/html2text.php
index 6500d2883..e07fb3538 100644
--- a/bin/html2text.php
+++ b/bin/html2text.php
@@ -19,7 +19,7 @@
 
 */
 
-define('INSTALL_PATH', realpath('./../') . '/');
+define('INSTALL_PATH', realpath(dirname(__FILE__) . '/..') . '/');
 require INSTALL_PATH.'program/include/iniset.php';
 
 $converter = new html2text(html_entity_decode($HTTP_RAW_POST_DATA, ENT_COMPAT, 'UTF-8'));
diff --git a/bin/modcss.php b/bin/modcss.php
index fc6305c81..08da36707 100644
--- a/bin/modcss.php
+++ b/bin/modcss.php
@@ -19,7 +19,7 @@
 
 */
 
-define('INSTALL_PATH', realpath('./../') . '/');
+define('INSTALL_PATH', realpath(dirname(__FILE__) . '/..') . '/');
 require INSTALL_PATH.'program/include/iniset.php';
 
 $source = "";