diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 3828fde1ce..76b974d0ce 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -1820,7 +1820,7 @@ function redirect($url, $return = false, $disable_cd_check = false)
 	}
 
 	// Redirect via an HTML form for PITA webservers
-	if (@preg_match('#Microsoft|WebSTAR|Xitami#', getenv('SERVER_SOFTWARE')))
+	if (@preg_match('#WebSTAR|Xitami#', getenv('SERVER_SOFTWARE')))
 	{
 		header('Refresh: 0; URL=' . $url);