diff --git a/biology/seqwish/Makefile b/biology/seqwish/Makefile
index 0bbf8c64b169..78689ef41487 100644
--- a/biology/seqwish/Makefile
+++ b/biology/seqwish/Makefile
@@ -1,31 +1,32 @@
 PORTNAME=	seqwish
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.7.11
 PORTREVISION=	1
 CATEGORIES=	biology
 MASTER_SITES=	https://github.com/ekg/seqwish/releases/download/v${DISTVERSION}/
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Alignment to variation graph inducer
 WWW=		https://github.com/ekg/seqwish
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+BROKEN_FreeBSD_13=	compilation fails: undefined symbol: __sync_val_compare_and_swap_16 ... referenced by transclosure.cpp
 BROKEN_FreeBSD_15=	compilation fails with clang-19, see https://github.com/ekg/seqwish/issues/126
 BROKEN_i386=	compilation fails: error: use of undeclared identifier '_pdep_u64'
 
 USES=		cmake:noninja compiler:c++14-lang
 
 CMAKE_ARGS=	-DEXTRA_FLAGS="" # disable -march=native
 
 PLIST_FILES=	bin/${PORTNAME}
 
 OPTIONS_DEFINE=		OPENMP
 OPTIONS_DEFAULT=	OPENMP
 
 OPENMP_CMAKE_BOOL=	USE_OPENMP
 OPENMP_CXXFLAGS=	-fopenmp
 OPENMP_BROKEN_OFF=	https://github.com/ekg/seqwish/issues/114
 
 .include <bsd.port.mk>