diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 97f8d70ae9f368c28a5f0d7e6b61c86e50ec2d8e..972639e438b69b8352c27776a6ddb89281431123 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -38,6 +38,7 @@ int        tsSlaveIndex = 1;
 int (*tscBuildMsg[TSDB_SQL_MAX])(SSqlObj *pSql, SSqlInfo *pInfo) = {0};
 
 int (*tscProcessMsgRsp[TSDB_SQL_MAX])(SSqlObj *pSql);
+char *doBuildMsgHeader(SSqlObj *pSql, char **pStart);
 void (*tscUpdateVnodeMsg[TSDB_SQL_MAX])(SSqlObj *pSql, char *buf);
 void tscProcessActivityTimer(void *handle, void *tmrId);
 int  tscKeepConn[TSDB_SQL_MAX] = {0};