Index: typo3/sysext/cms/tslib/class.tslib_fe.php
===================================================================
--- typo3/sysext/cms/tslib/class.tslib_fe.php	(revision 3658)
+++ typo3/sysext/cms/tslib/class.tslib_fe.php	(working copy)
@@ -1474,7 +1474,7 @@
 			$url_parts = parse_url($code);
 			if ($url_parts['host'] == '')	{
 				$url_parts['host'] = t3lib_div::getIndpEnv('HTTP_HOST');
-				$code = t3lib_div::getIndpEnv('TYPO3_REQUEST_HOST') . $code;
+				$code = t3lib_div::getIndpEnv('TYPO3_SITE_URL') . $code;
 				$checkBaseTag = false;
 			} else {
 				$checkBaseTag = true;