diff --git a/audio/lv2proc/Makefile b/audio/lv2proc/Makefile
index 6e1f923786f9..b74cffd06a2b 100644
--- a/audio/lv2proc/Makefile
+++ b/audio/lv2proc/Makefile
@@ -1,26 +1,32 @@
 PORTNAME=	lv2proc
 DISTVERSION=	0.5.1
 PORTREVISION=	2
 CATEGORIES=	audio
 MASTER_SITES=	SF/naspro/naspro/${DISTVERSION}/
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Simple command line effect processor using LV2 plugins
 WWW=		https://sourceforge.net/projects/naspro/
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	liblilv-0.so:audio/lilv \
 		libserd-0.so:devel/serd \
 		libsndfile.so:audio/libsndfile \
 		libsord-0.so:devel/sord \
 		libsratom-0.so:audio/sratom
 
 USES=		gmake pkgconfig tar:bz2
 GNU_CONFIGURE=	yes
 
 PLIST_FILES=	bin/lv2proc \
 		man/man1/lv2proc.1.gz
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400079 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
+CFLAGS+=	-Wno-error=strict-prototypes
+.endif
+
 .include <bsd.port.mk>