diff --git a/security/ktls_isa-l_crypto-kmod/Makefile b/security/ktls_isa-l_crypto-kmod/Makefile
index a7da8ff5935f..dfd76df4a1ec 100644
--- a/security/ktls_isa-l_crypto-kmod/Makefile
+++ b/security/ktls_isa-l_crypto-kmod/Makefile
@@ -1,40 +1,44 @@
 # Created by: Michal Bielicki <m.bielicki@llizardfs.com>
 
 PORTNAME=	isa-l_crypto
 PORTVERSION=	2.21.0
 DISTVERSIONPREFIX=	v
 PORTREVISION=	1
 CATEGORIES=	security
 PKGNAMEPREFIX=	ktls_
 PKGNAMESUFFIX=	-kmod
 
 MAINTAINER=	gallatin@FreeBSD.org
 COMMENT=	KTLS module using Intel(R) ISA-L crypto
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 ONLY_FOR_ARCHS=	amd64
 
 BUILD_DEPENDS=	yasm:devel/yasm
 
 USES=		kmod uidfix
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	01org
 
 MAKE_ENV+=	ISASRC=${WRKSRC}
 
 PLIST_FILES=	${KMODDIR}/ktls_intel-isa-l.ko
 
 .include <bsd.port.pre.mk>
 
 .if !exists(${SRC_BASE}/sys/sys/ktls.h)
 IGNORE=		requires KTLS support
 .endif
 
+.if ${OSVERSION} >= 1400016
+IGNORE=		is only supported on FreeBSD 13
+.endif
+
 post-extract:
 	${CP} ${FILESDIR}/* ${WRKSRC}/
 	${ECHO} "#include <sys/stdint.h>" > ${WRKSRC}/include/stdint.h
 
 .include <bsd.port.post.mk>