diff --git a/sbin/rtsol/Makefile b/sbin/rtsol/Makefile
index d373d6cbcd0..693fa498357 100644
--- a/sbin/rtsol/Makefile
+++ b/sbin/rtsol/Makefile
@@ -18,7 +18,7 @@ SRCDIR=	${.CURDIR}/../../usr.sbin/rtsold
 PROG=	rtsol
 SRCS=	rtsold.c rtsol.c if.c probe.c dump.c
 
-CFLAGS+=-DINET6
+CFLAGS+=-DINET6 -DHAVE_GETIFADDRS
 LDADD+=	-lkvm
 DPADD+=	${LIBKVM}