diff --git a/sql/characters.sql b/sql/characters.sql
index a6808fb54b6..c2233b7e282 100644
--- a/sql/characters.sql
+++ b/sql/characters.sql
@@ -55,6 +55,7 @@ CREATE TABLE `arena_team_member` (
   `played_season` int(10) unsigned NOT NULL default '0',
   `wons_season` int(10) unsigned NOT NULL default '0',
   `personal_rating` int(10) UNSIGNED NOT NULL DEFAULT '0',
+  PRIMARY KEY  (`arenateamid`,`guid`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 --