diff --git a/sys/netinet6/ip6_input.c b/sys/netinet6/ip6_input.c
index 083f7805651..9c1ca0fee12 100644
--- a/sys/netinet6/ip6_input.c
+++ b/sys/netinet6/ip6_input.c
@@ -65,6 +65,7 @@
  */
 
 #include "opt_ipsec.h"
+#include "opt_ip6fw.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
diff --git a/sys/netinet6/ip6_output.c b/sys/netinet6/ip6_output.c
index 0909e9b15b4..b901751fa0d 100644
--- a/sys/netinet6/ip6_output.c
+++ b/sys/netinet6/ip6_output.c
@@ -65,6 +65,7 @@
  */
 
 #include "opt_ipsec.h"
+#include "opt_ip6fw.h"
 
 #include <sys/param.h>
 #include <sys/malloc.h>