diff --git a/phpgwapi/inc/class.vfs_webdav_server.inc.php b/phpgwapi/inc/class.vfs_webdav_server.inc.php
index 3348b74a29..4e1cb38512 100644
--- a/phpgwapi/inc/class.vfs_webdav_server.inc.php
+++ b/phpgwapi/inc/class.vfs_webdav_server.inc.php
@@ -627,7 +627,7 @@ class vfs_webdav_server extends HTTP_WebDAV_Server_Filesystem
 	 */
 	function __construct()
 	{
-		if ($_SERVER['REQUEST_METHOD'] == 'GET' && ($this->force_download = strpos($_SERVER['REQUEST_URI'],'?download') !== false))
+		if ($_SERVER['REQUEST_METHOD'] == 'GET' && (($this->force_download = strpos($_SERVER['REQUEST_URI'],'?download')) !== false))
 		{
 			$_SERVER['REQUEST_URI'] = substr($_SERVER['REQUEST_URI'],0,$this->force_download);
 		}