diff --git a/workflow/engine/config/schema.xml b/workflow/engine/config/schema.xml
index c255993fc..a8dfd703e 100644
--- a/workflow/engine/config/schema.xml
+++ b/workflow/engine/config/schema.xml
@@ -349,6 +349,9 @@
     <index name="indexForAppUid">
       <index-column name="APP_UID"/>
     </index>
+    <index name="indexForMsgStatus">
+      <index-column name="APP_MSG_STATUS"/>
+    </index>
   </table>
   <table name="APP_OWNER">
     <vendor type="mysql">
diff --git a/workflow/engine/data/mysql/schema.sql b/workflow/engine/data/mysql/schema.sql
index c38fc05b9..4d2ebb4e0 100644
--- a/workflow/engine/data/mysql/schema.sql
+++ b/workflow/engine/data/mysql/schema.sql
@@ -164,7 +164,8 @@ CREATE TABLE `APP_MESSAGE`
 	`APP_MSG_SHOW_MESSAGE` TINYINT default 1 NOT NULL,
 	`APP_MSG_ERROR` MEDIUMTEXT,
 	PRIMARY KEY (`APP_MSG_UID`),
-	KEY `indexForAppUid`(`APP_UID`)
+	KEY `indexForAppUid`(`APP_UID`),
+	KEY `indexForMsgStatus`(`APP_MSG_STATUS`)
 )ENGINE=InnoDB  DEFAULT CHARSET='utf8' COMMENT='Messages in an Application';
 #-----------------------------------------------------------------------------
 #-- APP_OWNER