diff --git a/sysutils/slst/Makefile b/sysutils/slst/Makefile
index c9ff805998c1..1c9b493aef2a 100644
--- a/sysutils/slst/Makefile
+++ b/sysutils/slst/Makefile
@@ -1,19 +1,22 @@
 PORTNAME=	slst
 PORTVERSION=	0.2
 PORTREVISION=	1
 CATEGORIES=	sysutils
 MASTER_SITES=	http://www.vanheusden.com/slst/
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Generates syslog statistics to detect tendencies and unexpected change
 WWW=		http://www.vanheusden.com/slst/
 
+DEPRECATED=     No source. Source went missing in 2018.
+EXPIRATION_DATE=2025-05-15
+
 USES=		ncurses tar:tgz
 ALL_TARGET=	all
 
 PLIST_FILES=	bin/slst
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/slst
 
 .include <bsd.port.mk>