diff --git a/templates/posts.sql b/templates/posts.sql
index d10749f8..ac383ab0 100644
--- a/templates/posts.sql
+++ b/templates/posts.sql
@@ -27,6 +27,7 @@ CREATE TABLE IF NOT EXISTS `posts_{{ board }}` (
   `embed` text,
   UNIQUE KEY `id` (`id`),
   KEY `thread` (`thread`),
+  KEY `thread_id` (`thread`, `id`),
   KEY `time` (`time`),
   FULLTEXT KEY `body` (`body`)
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;