diff --git a/src/core/ipv6/ip6.c b/src/core/ipv6/ip6.c
index 3362249f..8cc9c010 100644
--- a/src/core/ipv6/ip6.c
+++ b/src/core/ipv6/ip6.c
@@ -46,6 +46,7 @@
 #include "lwip/def.h"
 #include "lwip/mem.h"
 #include "lwip/netif.h"
+#include "lwip/ip.h"
 #include "lwip/ip6.h"
 #include "lwip/ip6_addr.h"
 #include "lwip/ip6_frag.h"
diff --git a/src/core/netif.c b/src/core/netif.c
index 1c4b1b42..819b4ecc 100644
--- a/src/core/netif.c
+++ b/src/core/netif.c
@@ -63,6 +63,7 @@
 #include "lwip/etharp.h"
 #include "lwip/stats.h"
 #include "lwip/sys.h"
+#include "lwip/ip.h"
 #if ENABLE_LOOPBACK
 #if LWIP_NETIF_LOOPBACK_MULTITHREADING
 #include "lwip/tcpip.h"