diff --git a/examples/network/tcpserver.c b/examples/network/tcpserver.c
index 9fa7bc8fb8856bd4c818d964141f5f94a9a0e1f4..6d83acc1b29b77d8859a3a0dc8d0cda2e04119c4 100644
--- a/examples/network/tcpserver.c
+++ b/examples/network/tcpserver.c
@@ -76,7 +76,7 @@ void tcpserv(void* parameter)
 
            /* 从connected socket中接收数据，接收buffer是1024大小，但并不一定能够收到1024大小的数据 */
            bytes_received = recv(connected,recv_data, 1024, 0);
-           if (bytes_received < 0)
+           if (bytes_received <= 0)
            {
                /* 接收失败，关闭这个connected socket */
                lwip_close(connected);