diff --git a/devel/libbinio/Makefile b/devel/libbinio/Makefile
index e974784ca05f..37ed4e48083c 100644
--- a/devel/libbinio/Makefile
+++ b/devel/libbinio/Makefile
@@ -1,27 +1,33 @@
 PORTNAME=	libbinio
 PORTVERSION=	1.5
 DISTVERSIONPREFIX=	${PORTNAME}-
 CATEGORIES=	devel
 
 MAINTAINER=	ehaupt@FreeBSD.org
 COMMENT=	Binary I/O stream class library
 WWW=		https://adplug.github.io/libbinio/
 
 LICENSE=	LGPL21
 
 USES=		autoreconf compiler:c11 libtool pathfix
 USE_GITHUB=	yes
 USE_LDCONFIG=	yes
 
 GNU_CONFIGURE=	yes
 
 GH_ACCOUNT=	adplug
 
 INSTALL_TARGET=	install-strip
 
 PORTSCOUT=	skipv:start
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CPPFLAGS+=  -Dregister=
+.endif
+
 post-patch:
 	@${REINPLACE_CMD} -e 's|^\(SUBDIRS\ =\).*|\1 src|' ${WRKSRC}/Makefile.am
 
 .include <bsd.port.mk>