diff --git a/src/util/src/tsocket.c b/src/util/src/tsocket.c
index 49b69ea0a1..1a571c55bd 100644
--- a/src/util/src/tsocket.c
+++ b/src/util/src/tsocket.c
@@ -480,5 +480,5 @@ int32_t taosCopyFds(SOCKET sfd, SOCKET dfd, int64_t len) {
     leftLen -= readLen;
   }
 
-  return 0;
+  return len;
 }