diff --git a/net/rdist6/Makefile b/net/rdist6/Makefile
index fb9ff9bb073f..4b9bc9cd393a 100644
--- a/net/rdist6/Makefile
+++ b/net/rdist6/Makefile
@@ -15,6 +15,9 @@ MASTER_SITES=	http://www.magnicomp.com/download/rdist/ \
 MAINTAINER=	peter@FreeBSD.org
 
 .include <bsd.port.pre.mk>
+.if ${OSVERSION} < 400000
+BROKEN=		Not supported for pre-4.0 FreeBSD
+.endif
 
 # To avoid confusion with /usr/bin/rdist, you may prefer otherwise.
 RDIST_NAME?=	rdist6