diff --git a/net/lwip/src/lwipopts.h b/net/lwip/src/lwipopts.h
index d7fb5f2d23336c6891f594bae3f53e2b8560c960..65979d751df8fd040fe8d2a1f9510b7bafff4da6 100644
--- a/net/lwip/src/lwipopts.h
+++ b/net/lwip/src/lwipopts.h
@@ -182,7 +182,7 @@
 #ifdef RT_LWIP_TCP_SND_BUF
 #define TCP_SND_BUF                 RT_LWIP_TCP_SND_BUF
 #else
-#define TCP_SND_BUF                 1024
+#define TCP_SND_BUF                 2048
 #endif
 
 /* TCP sender buffer space (pbufs). This must be at least = 2 *