diff --git a/components/net/lwip-1.4.1/src/lwipopts.h b/components/net/lwip-1.4.1/src/lwipopts.h
index 10cb7893a7ad3e3c23979e1e282c2c22ec7601db..029a758747039c3c988934229b6bb003e2736dd4 100644
--- a/components/net/lwip-1.4.1/src/lwipopts.h
+++ b/components/net/lwip-1.4.1/src/lwipopts.h
@@ -117,6 +117,8 @@
 
 /* the number of simultaneously queued TCP */
 #ifdef RT_LWIP_TCP_SEG_NUM
+#define MEMP_NUM_TCP_SEG            RT_LWIP_TCP_SEG_NUM
+#else
 #define MEMP_NUM_TCP_SEG            TCP_SND_QUEUELEN
 #endif
 
@@ -176,7 +178,7 @@
 
 /* TCP sender buffer space (bytes). */
 #ifdef RT_LWIP_TCP_SND_BUF
-#define TCP_SND_BUF					RT_LWIP_TCP_SND_BUF
+#define TCP_SND_BUF					   RT_LWIP_TCP_SND_BUF
 #else
 #define TCP_SND_BUF                 (TCP_MSS * 2)
 #endif