diff --git a/include/default-opts/lwipopts.h b/include/default-opts/lwipopts.h
index 66240c6..29873ad 100644
--- a/include/default-opts/lwipopts.h
+++ b/include/default-opts/lwipopts.h
@@ -87,3 +87,7 @@
 #define LWIP_DHCP_AUTOIP_COOP_TRIES 3
 #define LWIP_SO_RCVTIMEO 1
 #define ifreq lwip_ifreq
+
+#define LWIP_DEBUG 1
+#define TCP_DEBUG LWIP_DBG_ON
+#define TCP_INPUT_DEBUG LWIP_DBG_ON
diff --git a/lib-lwip b/lib-lwip
index e05ec1e..dabf4ac 160000
--- a/lib-lwip
+++ b/lib-lwip
@@ -1 +1 @@
-Subproject commit e05ec1e1a8eda2b4eff979b83830dde36d7a5815
+Subproject commit dabf4acace59e7b23116e452d7407cc754171aaa