diff --git a/ip/iptunnel.c b/ip/iptunnel.c
index 3b466bf..2b2b78e 100644
--- a/ip/iptunnel.c
+++ b/ip/iptunnel.c
@@ -34,6 +34,7 @@
 #include "ip_common.h"
 #include "tunnel.h"
 
+#include <asm/byteorder.h>
 static void usage(void) __attribute__((noreturn));
 
 static void usage(void)