diff --git a/ports/unix/netif/tcpdump.c b/ports/unix/netif/tcpdump.c
index dd6e5c3..2177800 100644
--- a/ports/unix/netif/tcpdump.c
+++ b/ports/unix/netif/tcpdump.c
@@ -34,7 +34,7 @@
   
 #include "netif/tcpdump.h"
 #include "lwip/ip.h"
-#include "lwip/tcp.h"
+#include "lwip/tcp_impl.h"
 #include "lwip/udp.h"
 #include "lwip/inet.h"
 #include "lwip/inet_chksum.h"
diff --git a/ports/unix/proj/minimal/main.c b/ports/unix/proj/minimal/main.c
index 76afcbb..24bc4b7 100644
--- a/ports/unix/proj/minimal/main.c
+++ b/ports/unix/proj/minimal/main.c
@@ -47,7 +47,7 @@
 #include "lwip/ip_frag.h"
 #include "lwip/udp.h"
 #include "lwip/snmp_msg.h"
-#include "lwip/tcp.h"
+#include "lwip/tcp_impl.h"
 #include "mintapif.h"
 #include "netif/etharp.h"
 
diff --git a/ports/unix/proj/unixsim/simhost.c b/ports/unix/proj/unixsim/simhost.c
index 0dc3633..2a90b13 100644
--- a/ports/unix/proj/unixsim/simhost.c
+++ b/ports/unix/proj/unixsim/simhost.c
@@ -44,7 +44,7 @@
 
 #include "lwip/stats.h"
 
-#include "lwip/tcp.h"
+#include "lwip/tcp_impl.h"
 #include "lwip/inet_chksum.h"
 
 #include "lwip/tcpip.h"
diff --git a/ports/unix/proj/unixsim/simnode.c b/ports/unix/proj/unixsim/simnode.c
index 2d6865e..6d9e8cf 100644
--- a/ports/unix/proj/unixsim/simnode.c
+++ b/ports/unix/proj/unixsim/simnode.c
@@ -38,7 +38,7 @@
 #include "lwip/mem.h"
 #include "lwip/memp.h"
 #include "lwip/sys.h"
-#include "lwip/tcp.h"
+#include "lwip/tcp_impl.h"
 
 #include "lwip/stats.h"
 
diff --git a/ports/unix/proj/unixsim/simrouter.c b/ports/unix/proj/unixsim/simrouter.c
index c324408..4ae58f1 100644
--- a/ports/unix/proj/unixsim/simrouter.c
+++ b/ports/unix/proj/unixsim/simrouter.c
@@ -38,7 +38,7 @@
 #include "lwip/mem.h"
 #include "lwip/memp.h"
 #include "lwip/sys.h"
-#include "lwip/tcp.h"
+#include "lwip/tcp_impl.h"
 
 #include "lwip/stats.h"