diff --git a/src/api/pppapi.c b/src/api/pppapi.c
index b2a9a88c..3f7f0ebc 100644
--- a/src/api/pppapi.c
+++ b/src/api/pppapi.c
@@ -37,6 +37,7 @@
 
 #include "lwip/pppapi.h"
 #include "lwip/tcpip.h"
+#include "lwip/priv/tcpip_priv.h"
 #include "netif/ppp/pppoe.h"
 #include "netif/ppp/pppol2tp.h"
 #include "netif/ppp/pppos.h"
diff --git a/src/netif/ppp/pppos.c b/src/netif/ppp/pppos.c
index f1d922dd..84dfa37b 100644
--- a/src/netif/ppp/pppos.c
+++ b/src/netif/ppp/pppos.c
@@ -43,6 +43,7 @@
 #include "lwip/netif.h"
 #include "lwip/snmp_mib2.h"
 #include "lwip/tcpip.h"
+#include "lwip/priv/tcpip_priv.h"
 #include "lwip/api.h"
 #include "lwip/ip4.h" /* for ip4_input() */
 
diff --git a/test/unit/tcp/tcp_helper.c b/test/unit/tcp/tcp_helper.c
index a26c8271..e25956af 100644
--- a/test/unit/tcp/tcp_helper.c
+++ b/test/unit/tcp/tcp_helper.c
@@ -1,6 +1,6 @@
 #include "tcp_helper.h"
 
-#include "lwip/tcp_impl.h"
+#include "lwip/priv/tcp_priv.h"
 #include "lwip/stats.h"
 #include "lwip/pbuf.h"
 #include "lwip/inet_chksum.h"
diff --git a/test/unit/tcp/test_tcp.c b/test/unit/tcp/test_tcp.c
index 3b591796..746f0bba 100644
--- a/test/unit/tcp/test_tcp.c
+++ b/test/unit/tcp/test_tcp.c
@@ -1,6 +1,6 @@
 #include "test_tcp.h"
 
-#include "lwip/tcp_impl.h"
+#include "lwip/priv/tcp_priv.h"
 #include "lwip/stats.h"
 #include "tcp_helper.h"
 
diff --git a/test/unit/tcp/test_tcp_oos.c b/test/unit/tcp/test_tcp_oos.c
index 6d99f774..c2914233 100644
--- a/test/unit/tcp/test_tcp_oos.c
+++ b/test/unit/tcp/test_tcp_oos.c
@@ -1,6 +1,6 @@
 #include "test_tcp_oos.h"
 
-#include "lwip/tcp_impl.h"
+#include "lwip/priv/tcp_priv.h"
 #include "lwip/stats.h"
 #include "tcp_helper.h"