diff --git a/sql/relationdb_n.sql b/sql/relationdb_n.sql
index ea353ef..01419cc 100644
--- a/sql/relationdb_n.sql
+++ b/sql/relationdb_n.sql
@@ -102,7 +102,7 @@ CREATE TABLE `friend_apply` (
   PRIMARY KEY (`idx`),
   UNIQUE KEY `applyid` (`applyid`),
   KEY `target_id` (`target_id`),
-  KEY `target_sender` (`sender_id`)
+  KEY `target_sender` (`target_id`, `sender_id`)
 ) ENGINE=InnoDB AUTO_INCREMENT=10000 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 /*!40101 SET character_set_client = @saved_cs_client */;
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;