diff --git a/sysutils/ocijail/Makefile b/sysutils/ocijail/Makefile
index bded116ee1e4..ca00ef2077f7 100644
--- a/sysutils/ocijail/Makefile
+++ b/sysutils/ocijail/Makefile
@@ -1,26 +1,28 @@
 PORTNAME=	ocijail
 DISTVERSION=	0.1.rc1
 CATEGORIES=	sysutils
 
 MAINTAINER=	dfr@FreeBSD.org
 COMMENT=	Experimental, proof-of-concept OCI-compatible runtime for jails
 WWW=		https://github.com/dfr/ocijail
 
 LICENSE=	BSD3CLAUSE
 
+IGNORE_FreeBSD_12= Not supported on FreeBSD 12 (uses c++20)
+
 BUILD_DEPENDS=	bazel:devel/bazel bash:shells/bash
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	dfr
 GH_TAGNAME=	v0.1rc1
 
 PLIST_FILES=	bin/ocijail
 
 # Build happens in the //:install rule
 NO_BUILD=	yes
 BAZEL_OPTS=	--batch --output_user_root=${WRKDIR}/bazel_out
 
 do-install:
 	cd ${WRKSRC} && bazel ${BAZEL_OPTS} run --experimental_repository_disable_download //:install -- ${STAGEDIR}${PREFIX}/bin
 
 .include <bsd.port.mk>