diff --git a/phpBB/download/file.php b/phpBB/download/file.php
index e0e7e48f69..e6afb4f2ae 100644
--- a/phpBB/download/file.php
+++ b/phpBB/download/file.php
@@ -382,9 +382,13 @@ else
 		trigger_error('SORRY_AUTH_VIEW_ATTACH');
 	}
 
-	require_once $phpbb_root_path . 'includes/functions_compress.' . $phpEx;
 	phpbb_increment_downloads($db, $attachment_ids);
 
+	if (!class_exists('compress'))
+	{
+		require $phpbb_root_path . 'includes/functions_compress.' . $phpEx;
+	}
+
 	if (!in_array($archive, compress::methods()))
 	{
 		$archive = '.tar';