From 035bf4dcb05593d4d7dbfd7a9b22359e87f326ee Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon@gmx.de>
Date: Wed, 10 May 2017 13:40:17 +0200
Subject: [PATCH] Fixed bug #50992: window updated too often

---
 src/api/sockets.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/api/sockets.c b/src/api/sockets.c
index 0ff7e8c2..2c5d3d7d 100644
--- a/src/api/sockets.c
+++ b/src/api/sockets.c
@@ -863,9 +863,7 @@ lwip_recv_tcp(struct lwip_sock *sock, void *mem, size_t len, int flags)
   LWIP_ASSERT("this should be checked internally", NETCONNTYPE_GROUP(netconn_type(sock->conn)) == NETCONN_TCP);
 
   if (flags & MSG_DONTWAIT) {
-    apiflags = NETCONN_DONTBLOCK;
-  } else {
-    apiflags = 0;
+    apiflags |= NETCONN_DONTBLOCK;
   }
 
   do {