diff --git a/webdav.php b/webdav.php
index eba6104ba7..05aed7a4f3 100644
--- a/webdav.php
+++ b/webdav.php
@@ -68,8 +68,25 @@ $GLOBALS['egw_info'] = array(
 	)
 );
 // if you move this file somewhere else, you need to adapt the path to the header!
-include(dirname(__FILE__).'/header.inc.php');
-
+try
+{
+	include(dirname(__FILE__).'/header.inc.php');
+}
+catch (egw_exception_no_permission_app $e)
+{
+	if (isset($GLOBALS['egw_info']['user']['apps']['filemanager']))
+	{
+		$GLOBALS['egw_info']['currentapp'] = 'filemanager';
+	}
+	elseif (isset($GLOBALS['egw_info']['user']['apps']['sitemgr-site']))
+	{
+		$GLOBALS['egw_info']['currentapp'] = 'sitemgr-site';
+	}
+	else
+	{
+		throw $e;
+	}
+}
 $headertime = microtime(true);
 
 $webdav_server = new vfs_webdav_server();