diff --git a/devel/hare/Makefile b/devel/hare/Makefile
index eb21e9b24590..91a481c327b7 100644
--- a/devel/hare/Makefile
+++ b/devel/hare/Makefile
@@ -1,46 +1,50 @@
 PORTNAME=	hare
 PORTVERSION=	g20230205
 CATEGORIES=	devel
 MASTER_SITES=	https://git.sr.ht/~sircmpwn/${PORTNAME}/archive/
 PKGNAMESUFFIX=	-lang
 DISTNAME=	274b8b72
 DIST_SUBDIR=	hare
 
 MAINTAINER=	se@FreeBSD.org
 COMMENT=	Hare language build system and standard library
 WWW=		https://harelang.org/
 
 LICENSE=	MPL20 GPLv3
 LICENSE_COMB=	multi
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 ONLY_FOR_ARCHS=	amd64 # aarch64 riscv64
 
 BUILD_DEPENDS=	harec:lang/harec \
 		qbe:devel/qbe \
 		scdoc:textproc/scdoc
 RUN_DEPENDS=	harec:lang/harec
 
 MAKE_ARGS=	ARCH=${ARCH:S/^amd64$/x86_64/}
 
 WRKSRC=		${WRKDIR}/${PORTNAME}-${DISTNAME}
 
 OPTIONS_DEFINE=	DOCS
 
 .include <bsd.port.pre.mk>
 
+.if ${OPSYS} == FreeBSD && ${OSVERSION} < 1300000
+BROKEN=		pre-FreeBSD-13 assembler is not compatible with generated files
+.endif
+
 do-build:
 		${CP} ${FILESDIR}/config.mk ${WRKSRC}
 		cd ${WRKSRC} && ${MAKE} ${MAKE_ARGS}
 
 post-stage:
 		${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/*
 		${MV} ${STAGEDIR}${DATADIR}/src/hare/* ${STAGEDIR}${DATADIR}/
 		${MKDIR} ${STAGEDIR}${DOCSDIR}
 		${INSTALL_DATA} ${WRKSRC}/README.md ${STAGEDIR}${DOCSDIR}/
 		${INSTALL_DATA} ${WRKSRC}/docs/*.md ${STAGEDIR}${DOCSDIR}/
 
 do-test:
 		cd ${WRKSRC} && ${MAKE} ${MAKE_ARGS} check
 
 .include <bsd.port.post.mk>