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
@@ -16,8 +16,8 @@ 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>