Index: tools/ns6.c
--- tools/ns6.c.orig
+++ tools/ns6.c
@@ -40,8 +40,8 @@
 #include <unistd.h>
 
 #include <arpa/inet.h>
-#include <netinet/icmp6.h>
 #include <netinet/in.h>
+#include <netinet/icmp6.h>
 #include <netinet/ip6.h>
 
 #include "ipv6toolkit.h"
