diff --git a/sys/netinet6/ip6_input.c b/sys/netinet6/ip6_input.c
index ff1402faac69..23550acb1fcd 100644
--- a/sys/netinet6/ip6_input.c
+++ b/sys/netinet6/ip6_input.c
@@ -95,6 +95,7 @@ __FBSDID("$FreeBSD$");
 #include <net/if.h>
 #include <net/if_var.h>
 #include <net/if_types.h>
+#include <net/if_private.h>
 #include <net/if_dl.h>
 #include <net/route.h>
 #include <net/netisr.h>