diff --git a/db/laconica.sql b/db/laconica.sql
index a790a3fd27..5b57494d98 100644
--- a/db/laconica.sql
+++ b/db/laconica.sql
@@ -117,6 +117,7 @@ create table notice (
 
     index notice_profile_id_idx (profile_id),
     index notice_created_idx (created),
+    index notice_replyto_idx (reply_to),
     FULLTEXT(content)
 ) ENGINE=MyISAM CHARACTER SET utf8 COLLATE utf8_general_ci;