diff --git a/japanese/canna-server/Makefile b/japanese/canna-server/Makefile
index 9ad0366db1f2..b7f82ec63a85 100644
--- a/japanese/canna-server/Makefile
+++ b/japanese/canna-server/Makefile
@@ -1,33 +1,39 @@
 PORTNAME=	canna
 PORTVERSION=	3.7p3
 PORTREVISION=	10
 CATEGORIES=	japanese
 MASTER_SITES=	OSDN/canna
 PKGNAMESUFFIX=	-server
 DISTNAME=	Canna${PORTVERSION:S/.//g}
 
 MAINTAINER=	hrs@FreeBSD.org
 COMMENT=	Kana-to-Kanji conversion system, binary part
 WWW=		http://canna.sourceforge.jp/
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/COPYRIGHT
 
 LIB_DEPENDS=	libcanna.so:japanese/canna-lib
 
 USES=		imake tar:bzip2
 USE_RC_SUBR=	canna
 INSTALL_TARGET=	instserver instclient
 PORTDOCS=	canna.bib canna.sty Imakefile README.jp Makefile \
 		intern lisp man
 MAKE_JOBS_UNSAFE=	yes
 
 OPTIONS_DEFINE=	DOCS
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000 ))
+MAKE_ARGS+=	CCOPTIONS="-Wno-error=int-conversion"
+.endif
+
 post-install:
 	@cd ${INSTALL_WRKSRC} && ${SETENV} ${MAKE_ENV} ${MAKE} ${MAKE_FLAGS} \
 	    ${MAKEFILE} ${MAKE_ARGS} install.man
 	${MKDIR} ${STAGEDIR}${DOCSDIR}
 	cd ${WRKSRC}/doc && ${CP} -R ${PORTDOCS} ${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.mk>