diff --git a/audio/sidplayer/Makefile b/audio/sidplayer/Makefile
index 996e0a327228..d65bcad41616 100644
--- a/audio/sidplayer/Makefile
+++ b/audio/sidplayer/Makefile
@@ -1,31 +1,37 @@
 PORTNAME=	sidplayer
 PORTVERSION=	4.4
 PORTREVISION=	9
 CATEGORIES=	audio
 MASTER_SITES=	http://sidplayer.cebix.net/downloads/ \
 		LOCAL/ehaupt
 DISTNAME=	SIDPlayer-${PORTVERSION}
 
 MAINTAINER=	ehaupt@FreeBSD.org
 COMMENT=	C64 SID tune player
 WWW=		https://sidplayer.cebix.net/
 
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		sdl
 USE_SDL=	sdl
 GNU_CONFIGURE=	yes
 
 OPTIONS_DEFINE=	DOCS
 OPTIONS_SUB=	yes
 SUB_FILES=	pkg-message
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CPPFLAGS+=	-Dregister=
+.endif
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/src/${PORTNAME} ${STAGEDIR}${PREFIX}/bin/${PORTNAME}
 
 do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/PSID\ Demo/* ${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.mk>