diff --git a/sys/modules/ipfw/Makefile b/sys/modules/ipfw/Makefile
index cd5a6f791e4..6f877e4fb6e 100644
--- a/sys/modules/ipfw/Makefile
+++ b/sys/modules/ipfw/Makefile
@@ -3,7 +3,9 @@
 .PATH: ${.CURDIR}/../../netinet
 
 KMOD=	ipfw
-SRCS=	ip_fw2.c ip_fw_pfil.c
+SRCS=	ip_fw2.c ip_fw_pfil.c \
+	opt_inet.h opt_ipfw.h opt_ipdn.h opt_ipdivert.h opt_ipsec.h \
+	opt_pfil_hooks.h
 
 CFLAGS+= -DIPFIREWALL
 #
@@ -14,5 +16,7 @@ CFLAGS+= -DIPFIREWALL
 #If you want it to pass all packets by default
 #CFLAGS+= -DIPFIREWALL_DEFAULT_TO_ACCEPT
 #
+opt_inet.h:
+	echo "#define INET 1" > opt_inet.h
 
 .include <bsd.kmod.mk>