diff --git a/lwip/esp_interface.c b/lwip/esp_interface.c
index 8157c8b..f67f9dd 100644
--- a/lwip/esp_interface.c
+++ b/lwip/esp_interface.c
@@ -166,9 +166,10 @@ void pp_recycle_rx_pbuf(struct pbuf *p)
 
 /* Return the number of ooseq bytes that can be retained given the current
  * size 'n'. */
-size_t ooseq_bytes_limit(struct tcp_seg *ooseq)
+size_t ooseq_bytes_limit(struct tcp_pcb *pcb)
 {
 #if COPY_PP_RX_PBUFS
+    struct tcp_seg *ooseq = pcb->ooseq;
     size_t ooseq_blen = 0;
     for (; ooseq != NULL; ooseq = ooseq->next) {
         struct pbuf *p = ooseq->p;
@@ -192,8 +193,9 @@ size_t ooseq_bytes_limit(struct tcp_seg *ooseq)
 
 /* Return the number of ooseq pbufs that can be retained given the current
  * size 'n'. */
-size_t ooseq_pbufs_limit(struct tcp_seg *ooseq)
+size_t ooseq_pbufs_limit(struct tcp_pcb *pcb)
 {
+    struct tcp_seg *ooseq = pcb->ooseq;
     size_t ooseq_qlen = 0;
     for (; ooseq != NULL; ooseq = ooseq->next) {
         struct pbuf *p = ooseq->p;
diff --git a/lwip/include/arch/cc.h b/lwip/include/arch/cc.h
index ed169ea..e7cf291 100644
--- a/lwip/include/arch/cc.h
+++ b/lwip/include/arch/cc.h
@@ -48,9 +48,9 @@ void sdk_system_pp_recycle_rx_pkt(struct esf_buf *);
 struct pbuf;
 void pp_recycle_rx_pbuf(struct pbuf *);
 
-struct tcp_seg;
-size_t ooseq_bytes_limit(struct tcp_seg *ooseq);
-size_t ooseq_pbufs_limit(struct tcp_seg *ooseq);
+struct tcp_pcb;
+size_t ooseq_bytes_limit(struct tcp_pcb *);
+size_t ooseq_pbufs_limit(struct tcp_pcb *);
 
 /* Define generic types used in lwIP */
 typedef uint8_t    u8_t;
diff --git a/lwip/lwip b/lwip/lwip
index b9416cd..16c0f92 160000
--- a/lwip/lwip
+++ b/lwip/lwip
@@ -1 +1 @@
-Subproject commit b9416cd99fbc696f7be1894f1c4a635e2cc7503f
+Subproject commit 16c0f928b5d6f557e845d96782cb3fa4e8e549fd