diff --git a/artiq/runtime/liblwip/Makefile b/artiq/runtime/liblwip/Makefile
index f687a77c6..88de6a717 100644
--- a/artiq/runtime/liblwip/Makefile
+++ b/artiq/runtime/liblwip/Makefile
@@ -21,17 +21,17 @@ COREFILES=core/mem.c \
 	core/tcp_out.c \
 	core/udp.c \
 	core/inet_chksum.c \
-	core/timers.c \
+	core/timeouts.c \
 	core/init.c
 
-CORE4FILES=core/ipv4/icmp.c \
+CORE4FILES=core/ipv4/etharp.c \
+	core/ipv4/icmp.c \
 	core/ipv4/ip4.c \
 	core/ipv4/ip4_addr.c \
-	core/ipv4/ip_frag.c
+	core/ipv4/ip4_frag.c
 
 # NETIFFILES: Files implementing various generic network interface functions.
-NETIFFILES=netif/etharp.c \
-	netif/ethernet.c
+NETIFFILES=netif/ethernet.c
 
 PPPFILES=netif/ppp/auth.c \
 	netif/ppp/fsm.c \
diff --git a/artiq/runtime/liblwip/arch/cc.h b/artiq/runtime/liblwip/arch/cc.h
index e1c4c42ab..fffd246ff 100644
--- a/artiq/runtime/liblwip/arch/cc.h
+++ b/artiq/runtime/liblwip/arch/cc.h
@@ -6,33 +6,8 @@
 #define __ARCH_CC_H__
 
 /* Include some files for defining library routines */
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
 #define BYTE_ORDER BIG_ENDIAN
 
-/* Define generic types */
-typedef unsigned   char    u8_t;
-typedef signed     char    s8_t;
-typedef unsigned   short   u16_t;
-typedef signed     short   s16_t;
-typedef unsigned   long    u32_t;
-typedef signed     long    s32_t;
-
-typedef u32_t mem_ptr_t;
-
-/* Define (sn)printf formatters for these types */
-#define U8_F "c"
-#define S8_F "c"
-#define X8_F "x"
-#define U16_F "u"
-#define S16_F "d"
-#define X16_F "x"
-#define U32_F "u"
-#define S32_F "d"
-#define X32_F "x"
-
 /* Compiler hints for packing structures */
 #define PACK_STRUCT_FIELD(x) x
 #define PACK_STRUCT_STRUCT __attribute__((packed))
diff --git a/artiq/runtime/liblwip/arch/sys_arch.h b/artiq/runtime/liblwip/arch/sys_arch.h
deleted file mode 100644
index a9e2503e2..000000000
--- a/artiq/runtime/liblwip/arch/sys_arch.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// This file is Copyright (c) 2015 Florent Kermarrec <florent@enjoy-digital.fr>
-// LiteETH lwIP port for ARTIQ
-// License: BSD
-
-#ifndef __ARCH_SYS_ARCH_H__
-#define __ARCH_SYS_ARCH_H__
-
-#define SYS_MBOX_NULL NULL
-#define SYS_SEM_NULL  NULL
-
-typedef void * sys_prot_t;
-
-typedef void * sys_sem_t;
-
-typedef void * sys_mbox_t;
-
-typedef void * sys_thread_t;
-
-#endif /* __ARCH_SYS_ARCH_H__ */
-
diff --git a/artiq/runtime/liblwip/lwipopts.h b/artiq/runtime/liblwip/lwipopts.h
index 1dc945e96..36ebf7234 100644
--- a/artiq/runtime/liblwip/lwipopts.h
+++ b/artiq/runtime/liblwip/lwipopts.h
@@ -40,6 +40,8 @@
 
 #define LWIP_CALLBACK_API 1
 
+#define SYS_LIGHTWEIGHT_PROT    0
+
 /* -------- TCP Timer Intervals ------- */
 #define TCP_TMR_INTERVAL       1    /* The TCP timer interval in
                                        milliseconds. */
diff --git a/artiq/runtime/lwip b/artiq/runtime/lwip
index 33955c636..216bf8949 160000
--- a/artiq/runtime/lwip
+++ b/artiq/runtime/lwip
@@ -1 +1 @@
-Subproject commit 33955c636d17bee230cde746a92e1cff11a7a177
+Subproject commit 216bf89491815029aa15463a18744afa04df58fe
diff --git a/artiq/runtime/main.c b/artiq/runtime/main.c
index c9f6f0951..30c130830 100644
--- a/artiq/runtime/main.c
+++ b/artiq/runtime/main.c
@@ -9,13 +9,10 @@
 #include <hw/flags.h>
 
 #include <lwip/init.h>
-#include <lwip/memp.h>
 #include <lwip/ip4_addr.h>
-#include <lwip/ip4.h>
 #include <lwip/netif.h>
-#include <lwip/sys.h>
+#include <lwip/timeouts.h>
 #include <lwip/tcp.h>
-#include <lwip/timers.h>
 #ifdef CSR_ETHMAC_BASE
 #include <netif/etharp.h>
 #include <liteethif.h>
@@ -32,6 +29,7 @@ static struct netif netif;
 static ppp_pcb *ppp;
 #endif
 
+void lwip_service(void);
 void lwip_service(void)
 {
     sys_check_timeouts();
@@ -107,6 +105,7 @@ static void fsip_or_default(struct ip4_addr *d, char *key, int i1, int i2, int i
 #endif
 }
 
+void network_init(void);
 void network_init(void)
 {
     struct ip4_addr local_ip;
@@ -169,14 +168,17 @@ extern void _fheap, _eheap;
 
 extern void rust_main();
 
+u16_t tcp_sndbuf_(struct tcp_pcb *pcb);
 u16_t tcp_sndbuf_(struct tcp_pcb *pcb) {
     return tcp_sndbuf(pcb);
 }
 
+u8_t* tcp_so_options_(struct tcp_pcb *pcb);
 u8_t* tcp_so_options_(struct tcp_pcb *pcb) {
     return &pcb->so_options;
 }
 
+void tcp_nagle_disable_(struct tcp_pcb *pcb);
 void tcp_nagle_disable_(struct tcp_pcb *pcb) {
     tcp_nagle_disable(pcb);
 }