diff --git a/security/akmos/Makefile b/security/akmos/Makefile
index 82d620c8129d..d4dcefed91fc 100644
--- a/security/akmos/Makefile
+++ b/security/akmos/Makefile
@@ -1,45 +1,48 @@
 PORTNAME=	akmos
 PORTVERSION=	0.7.2
 PORTREVISION=	3
 CATEGORIES=	security
 
 MAINTAINER=	melanhit@gmail.com
 COMMENT=	Cryptographic library with low footprint
 WWW=		https://github.com/melanhit/akmos
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+DEPRECATED=	Last release in 2018, no active development for years and no users in tree
+EXPIRATION_DATE=2024-03-31
+
 BUILD_DEPENDS=	as:devel/binutils
 
 USES=		cmake compiler:c++11-lang
 USE_GITHUB=	yes
 GH_ACCOUNT=	melanhit
 USE_LDCONFIG=	yes
 
 GNU_CONFIGURE=	yes
 
 # Fix build with clang11
 CFLAGS+=	-fcommon
 
 OPTIONS_DEFINE=	ASM TEST BENCH
 OPTIONS_DEFAULT=ASM
 OPTIONS_SUB=	yes
 
 ASM_CMAKE_ON=	-DAKMOS_USE_ASM:BOOL=TRUE
 ASM_CMAKE_OFF=	-DAKMOS_USE_ASM:BOOL=FALSE
 
 BENCH_CMAKE_ON=	-DAKMOS_ENABLE_BENCH:BOOL=TRUE
 BENCH_CMAKE_OFF=-DAKMOS_ENABLE_BENCH:BOOL=FALSE
 BENCH_DESC=	Install benchmark
 
 TEST_CMAKE_ON=	-DAKMOS_ENABLE_TEST:BOOL=TRUE
 TEST_CMAKE_OFF=	-DAKMOS_ENABLE_TEST:BOOL=FALSE
 
 .include <bsd.port.pre.mk>
 
 .if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400079 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
 CFLAGS+=	-Wno-error=strict-prototypes
 .endif
 
 .include <bsd.port.post.mk>