diff --git a/devel/rubygem-cool.io/Makefile b/devel/rubygem-cool.io/Makefile
index fbafd0c02372..d846ea2c9758 100644
--- a/devel/rubygem-cool.io/Makefile
+++ b/devel/rubygem-cool.io/Makefile
@@ -1,17 +1,23 @@
 PORTNAME=	cool.io
 PORTVERSION=	1.7.1
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Gems for cool.io
 WWW=		https://github.com/tarcieri/cool.io
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 RUN_DEPENDS=	rubygem-iobuffer>=1.0.0:devel/rubygem-iobuffer
 
 USES=		gem
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CONFIGURE_ARGS+=	--with-cflags="-Wno-error=incompatible-function-pointer-types"
+.endif
+
 .include <bsd.port.mk>