diff --git a/lwip/src/include/lwipopts.h b/lwip/src/include/lwipopts.h
index bf0d78d6..7da133db 100644
--- a/lwip/src/include/lwipopts.h
+++ b/lwip/src/include/lwipopts.h
@@ -100,7 +100,7 @@
 #define TIMERS_DEBUG		LWIP_DBG_OFF
 
 
-#if 0
+#if 1
 #define LWIP_TCPIP_CORE_LOCKING_INPUT   1
 #define LWIP_TCPIP_CORE_LOCKING         1
 #endif