diff --git a/emulators/yaze-ag/Makefile b/emulators/yaze-ag/Makefile
index ab3c39299eab..a6b89654d24f 100644
--- a/emulators/yaze-ag/Makefile
+++ b/emulators/yaze-ag/Makefile
@@ -1,39 +1,39 @@
 # $FreeBSD$
 
 PORTNAME=	yaze-ag
 DISTVERSION=	2.51.0-rc1
 CATEGORIES=	emulators
 MASTER_SITES=	http://www.mathematik.uni-ulm.de/users/ag/yaze-ag/devel/
 
 MAINTAINER=	se@FreeBSD.org
 COMMENT=	Z80 and CP/M-80 emulator
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libreadline.so:devel/readline
 
-USE_CSTD=	c11
+USES=		compiler:c11
 
 MAKEFILE=	Makefile_freebsd
 MAKE_ENV=	BINDIR=${PREFIX}/bin \
 		DOCDIR=${DOCSDIR} \
 		DOCHTMLDIR=${DOCSDIR}/html \
 		DSKDIR=${DATADIR}/disks \
 		LIBDIR=${DATADIR} \
 		MANDIR=${MAN1PREFIX}/man/man1 \
 		OPTIMIZE="${CFLAGS}" \
 		STAGEDIR="${STAGEDIR}"
 
 OPTIONS_DEFINE=	DOCS
 
 post-build:
 		${REINPLACE_CMD} -e 's:%%DATADIR%%:${DATADIR}:' \
 				 -e 's:%%DOCSDIR%%:${DOCSDIR}:' \
 				 -e 's:%%LIBEXECDIR%%:${PREFIX}/libexec:' \
 							${WRKSRC}/yaze.sh
 
 do-install-DOCS-on:
 		${SETENV} ${MAKE_ENV} ${MAKE} -C ${WRKSRC} -f ${MAKEFILE} install-doc
 
 .include <bsd.port.mk>