diff --git a/biology/dsr-pdb/Makefile b/biology/dsr-pdb/Makefile
index 873e2c2a4e12..c73b661acd4f 100644
--- a/biology/dsr-pdb/Makefile
+++ b/biology/dsr-pdb/Makefile
@@ -1,36 +1,38 @@
 PORTNAME=	dsr-pdb
 DISTVERSION=	1.0.3
 PORTREVISION=	5
 CATEGORIES=	biology
 MASTER_SITES=	https://graphics.stanford.edu/~drussel/
 DISTNAME=	${PORTNAME}
 DIST_SUBDIR=	${PORTNAME}-${DISTVERSION}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Simple C++ PDB reader (reads the protein description format)
 
 LICENSE=	LGPL21
 LICENSE_FILE=	${WRKSRC}/COPYING.txt
 
+BROKEN_aarch64=	ld: error: undefined symbol: .mcount (see bug#262709)
+
 LIB_DEPENDS=	libboost_program_options.so:devel/boost-libs
 
 USES=		compiler:c++11-lang gmake libtool localbase:ldflags tar:tgz
 GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
 
 WRKSRC=		${WRKDIR}/${PORTNAME}-${PORTVERSION}
 CXXFLAGS+=	-fPIC --std=c++11 # libboost_program_options.so isn't found without --std=c++11
 
 post-patch:
 .for dir in lib tools test
 	@cd ${WRKSRC}/${dir} && ${LN} -s ../ dsrpdb
 .endfor
 
 post-build: # the project itself doesn't support shared libraries in a regular way
 	@cd ${WRKSRC}/lib && ${CXX} ${LDFLAGS} --shared -Wl,-soname,libdsrpdb.so -o libdsrpdb.so *.o
 
 post-install:
 	${INSTALL_DATA} ${WRKSRC}/config.h ${STAGEDIR}${PREFIX}/include/dsrpdb
 	${INSTALL_LIB} ${WRKSRC}/lib/libdsrpdb.so ${STAGEDIR}${PREFIX}/lib
 
 .include <bsd.port.mk>