diff --git a/phpBB/includes/functions_display.php b/phpBB/includes/functions_display.php
index 6164885732..1f541a7733 100644
--- a/phpBB/includes/functions_display.php
+++ b/phpBB/includes/functions_display.php
@@ -1298,6 +1298,11 @@ function get_user_avatar($avatar, $avatar_type, $avatar_width, $avatar_height, $
 */
 function phpbb_gen_download_links($param_key, $param_val, $phpbb_root_path, $phpEx)
 {
+	if (!class_exists('compress'))
+	{
+		require $phpbb_root_path . 'includes/functions_compress.' . $phpEx;
+	}
+
 	$methods = compress::methods();
 	$links = array();
 
diff --git a/phpBB/viewtopic.php b/phpBB/viewtopic.php
index a65944742e..9f044e0a89 100644
--- a/phpBB/viewtopic.php
+++ b/phpBB/viewtopic.php
@@ -1318,7 +1318,6 @@ $template->assign_vars(array(
 	'S_HAS_ATTACHMENTS' => !empty($attachments),
 ));
 
-require_once $phpbb_root_path . 'includes/functions_compress.' . $phpEx;
 $methods = phpbb_gen_download_links('topic_id', $topic_id, $phpbb_root_path, $phpEx);
 foreach ($methods as $method)
 {