diff --git a/net-mgmt/ipv6calc/Makefile b/net-mgmt/ipv6calc/Makefile
index dccfcd5af307..0f603565f941 100644
--- a/net-mgmt/ipv6calc/Makefile
+++ b/net-mgmt/ipv6calc/Makefile
@@ -1,32 +1,32 @@
 PORTNAME=	ipv6calc
 PORTVERSION=	4.0.2
 CATEGORIES=	net-mgmt
 MASTER_SITES=	https://www.bieringer.de/ftp/pub/linux/IPv6/ipv6calc/ \
 		https://www.deepspace6.net/ftp/pub/ds6/sources/ipv6calc/
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Convert, change, and calculate with IPv6 addresses
 WWW=		https://www.deepspace6.net/projects/ipv6calc.html \
 		https://github.com/pbiering/ipv6calc
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	bash:shells/bash
 
 USES=		gmake perl5 shebangfix ssl
 
 GNU_CONFIGURE=	yes
 
 SHEBANG_FILES=	tools/*
 
 .include <bsd.port.pre.mk>
 
-.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400079 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
+.if ${OPSYS} == FreeBSD && ((${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000) || ${OSVERSION} >= 1400079)
 CFLAGS+=       -Wno-error=deprecated-non-prototype
 .endif
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/*
 
 .include <bsd.port.post.mk>