diff --git a/lwip/src/include/lwipopts.h b/lwip/src/include/lwipopts.h
index 2ecae151..bb3e4bf4 100644
--- a/lwip/src/include/lwipopts.h
+++ b/lwip/src/include/lwipopts.h
@@ -229,7 +229,7 @@
 #define DHCP_DEBUG		LWIP_DBG_OFF
 #define ETHARP_DEBUG		LWIP_DBG_OFF
 #define TCPIP_DEBUG		LWIP_DBG_OFF
-#define SYS_DEBUG		LWIP_DBG_ON
+#define SYS_DEBUG		LWIP_DBG_OFF
 #define RAW_DEBUG		LWIP_DBG_OFF
 #define MEM_DEBUG		LWIP_DBG_OFF
 #define IP_DEBUG		LWIP_DBG_OFF