diff --git a/src/rpc/src/trpc.c b/src/rpc/src/trpc.c
index 9e0b5dab0f1f2ca587af3dd9f3233b355d1d80af..87506861b1a660fa7745012a45120942a2772ec4 100755
--- a/src/rpc/src/trpc.c
+++ b/src/rpc/src/trpc.c
@@ -239,8 +239,8 @@ char *taosBuildReqHeader(void *param, char type, char *msg) {
   pHeader->spi = 0;
   pHeader->tcp = 0;
   pHeader->encrypt = 0;
-  pHeader->tranId = atomic_add_fetch_32(&pConn->tranId, 1);
-  if (pHeader->tranId == 0) pHeader->tranId = atomic_add_fetch_32(&pConn->tranId, 1);
+  pHeader->tranId = atomic_add_fetch_16(&pConn->tranId, 1);
+  if (pHeader->tranId == 0) pHeader->tranId = atomic_add_fetch_16(&pConn->tranId, 1);
 
   pHeader->sourceId = pConn->ownId;
   pHeader->destId = pConn->peerId;