diff --git a/lwip/src/include/lwipopts.h b/lwip/src/include/lwipopts.h
index 28fe6150..61e08e78 100644
--- a/lwip/src/include/lwipopts.h
+++ b/lwip/src/include/lwipopts.h
@@ -99,4 +99,6 @@
 #define NETIF_DEBUG		LWIP_DBG_OFF
 #define TIMERS_DEBUG		LWIP_DBG_OFF
 
+#define LWIP_TCPIP_CORE_LOCKING_INPUT 1
+
 #endif