diff --git a/tcpsock/tcp_socket.go b/tcpsock/tcp_socket.go
index 7208a3c..f1b62aa 100644
--- a/tcpsock/tcp_socket.go
+++ b/tcpsock/tcp_socket.go
@@ -88,7 +88,7 @@ func (s *socket) Recv(length int) (msg *api.SockMessage, err error) {
 	var recv, left int
 	if length <= 0 {
 		once = true
-		length = types.PACK_FRAGMENT_MAX
+		length = types.TCP_FRAGMENT_MAX
 	}
 	left = length
 	data := s.makeBuffer(length)
diff --git a/types/types.go b/types/types.go
index f0b278e..b7e7d7f 100644
--- a/types/types.go
+++ b/types/types.go
@@ -14,6 +14,7 @@ const (
 
 const (
 	PACK_FRAGMENT_MAX = 1500
+	TCP_FRAGMENT_MAX  = 1024 * 1024
 )
 
 const (