diff --git a/graphics/R-cran-s2/Makefile b/graphics/R-cran-s2/Makefile
index 97acd1d34d0a..73f5e0ba0512 100644
--- a/graphics/R-cran-s2/Makefile
+++ b/graphics/R-cran-s2/Makefile
@@ -1,18 +1,21 @@
 PORTNAME=	s2
 PORTVERSION=	1.0.5
 CATEGORIES=	graphics
 DISTNAME=	${PORTNAME}_${PORTVERSION}
 
 MAINTAINER=	tota@FreeBSD.org
 COMMENT=	Spherical Geometry Operators Using the S2 Geometry Library
 
 LICENSE=	APACHE20
 
+NOT_FOR_ARCHS=	i386
+NOT_FOR_ARCHS_REASON=	is currently 64-bit only
+
 CRAN_DEPENDS=	R-cran-Rcpp>0:devel/R-cran-Rcpp \
 		R-cran-wk>0:math/R-cran-wk
 BUILD_DEPENDS=	${CRAN_DEPENDS}
 RUN_DEPENDS=	${CRAN_DEPENDS}
 
 USES=		cran:auto-plist,compiles
 
 .include <bsd.port.mk>