diff --git a/config/dmsDefaults.php b/config/dmsDefaults.php
index 685d9ea..6ee74b4 100644
--- a/config/dmsDefaults.php
+++ b/config/dmsDefaults.php
@@ -393,7 +393,7 @@ class KTInit {
 
     // {{{ guessRootUrl()
     function guessRootUrl() {
-        $urlpath = $_SERVER['SCRIPT_NAME'];
+        $urlpath = str_replace(KT_DIR, '', $_SERVER['SCRIPT_NAME']);
         $bFound = false;
         $rootUrl = '';
         while ($urlpath) {
@@ -655,4 +655,4 @@ require_once(KT_LIB_DIR . '/templating/kt3template.inc.php');
 $GLOBALS['main'] =new KTPage();
 
 
-?>
\ No newline at end of file
+?>