diff --git a/biology/seqwish/Makefile b/biology/seqwish/Makefile
index 0bbf8c64b169..78689ef41487 100644
--- a/biology/seqwish/Makefile
+++ b/biology/seqwish/Makefile
@@ -12,6 +12,7 @@ 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'