diff --git a/sysutils/gstopd/Makefile b/sysutils/gstopd/Makefile
index 56de024263d3..607c8488975f 100644
--- a/sysutils/gstopd/Makefile
+++ b/sysutils/gstopd/Makefile
@@ -1,15 +1,21 @@
 PORTNAME=	gstopd
 PORTVERSION=	1.1
 CATEGORIES=	sysutils
 MASTER_SITES=	LOCAL/mr
 
 MAINTAINER=	mr@FreeBSD.org
 COMMENT=	GEOM stop daemon
 
 PLIST_FILES=	sbin/gstopd man/man8/gstopd.8.gz
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CFLAGS+=	-Wno-error=unused-but-set-variable
+.endif
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/gstopd ${STAGEDIR}${PREFIX}/sbin
 	${INSTALL_MAN} ${WRKSRC}/gstopd.8 ${STAGEDIR}${PREFIX}/man/man8
 
 .include <bsd.port.mk>