diff --git a/phpBB/download/file.php b/phpBB/download/file.php
index f71afb670e..f7cf0d09e2 100644
--- a/phpBB/download/file.php
+++ b/phpBB/download/file.php
@@ -670,8 +670,9 @@ function set_modified_headers($stamp, $browser)
 	{
 		if ($last_load !== false && $last_load <= $stamp)
 		{
-			if (@php_sapi_name() === 'CGI')
+			if (substr(strtolower(@php_sapi_name()),0,3) === 'cgi')
 			{
+				// in theory, we shouldn't need that due to php doing it. Reality offers a differing opinion, though
 				header('Status: 304 Not Modified', true, 304);
 			}
 			else