diff --git a/converters/rubygem-iconv/Makefile b/converters/rubygem-iconv/Makefile
index 2c532ba76766..612c24a5ec14 100644
--- a/converters/rubygem-iconv/Makefile
+++ b/converters/rubygem-iconv/Makefile
@@ -1,23 +1,23 @@
 PORTNAME=	iconv
 PORTVERSION=	1.0.8
 CATEGORIES=	converters rubygems
 MASTER_SITES=	RG
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	iconv wrapper library
 WWW=		https://github.com/ruby/iconv
 
 LICENSE=	BSD2CLAUSE RUBY
 LICENSE_COMB=	dual
 LICENSE_FILE_BSD2CLAUSE=${WRKSRC}/BSDL
 LICENSE_FILE_RUBY=	${WRKSRC}/LICENSE.txt
 
 USES=		gem iconv
 
 .include <bsd.port.options.mk>
 
-.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000 ))
-CONFIGURE_ARGS+=	--with-cflags="-Wno-error=incompatible-function-pointer-types"
+.if ${OPSYS} == FreeBSD && ((${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000) || ${OSVERSION} >= 1400091)
+CONFIGURE_ARGS+=--with-cflags="-Wno-error=incompatible-function-pointer-types"
 .endif
 
 .include <bsd.port.mk>