diff --git a/lib/libutil/Makefile b/lib/libutil/Makefile
index 60d4aaf061de..4e6e0abfa15e 100644
--- a/lib/libutil/Makefile
+++ b/lib/libutil/Makefile
@@ -1,11 +1,15 @@
 #	@(#)Makefile	8.1 (Berkeley) 6/4/93
 #	$FreeBSD$
 
+.include <bsd.own.mk>
+
 LIB=	util
 SHLIB_MAJOR= 6
 SHLIBDIR?= /lib
 CFLAGS+=-DLIBC_SCCS -I${.CURDIR} -I${.CURDIR}/../libc/gen/
+.if ${MK_INET6_SUPPORT} != "no"
 CFLAGS+=-DINET6
+.endif
 SRCS=	_secure_path.c auth.c fparseln.c humanize_number.c kld.c login.c \
 	login_auth.c login_cap.c login_class.c login_crypt.c login_ok.c \
 	login_times.c login_tty.c logout.c logwtmp.c \