diff --git a/science/py-ncrystal/Makefile b/science/py-ncrystal/Makefile
index aea5b6f7f0c9..bd62bdb3b4b3 100644
--- a/science/py-ncrystal/Makefile
+++ b/science/py-ncrystal/Makefile
@@ -1,39 +1,45 @@
 PORTNAME=	ncrystal
 DISTVERSIONPREFIX=	v
 DISTVERSION=	4.4.6
 CATEGORIES=	science # physics
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Library for thermal neutron transport in crystals and other materials
 WWW=		https://mctools.github.io/ncrystal/
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 BUILD_DEPENDS=	${PY_SETUPTOOLS} \
 		${PYTHON_PKGNAMEPREFIX}numpy>=1.16:math/py-numpy@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}scikit-build-core>0:devel/py-scikit-build-core@${PY_FLAVOR} \
 		cmake:devel/cmake-core
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}numpy>=1.16:math/py-numpy@${PY_FLAVOR}
 
 USES=		python
 USE_PYTHON=	pep517 concurrent autoplist
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	mctools
 
 TEST_ENV=	${MAKE_ENV} \
 		PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR} \
 		PATH=${STAGEDIR}${PREFIX}/bin:${PATH}
 #TEST_WRKSRC=	${WRKSRC}/ncrystal_python
 
+.include <bsd.port.pre.mk>
+
+.if ${OSVERSION} < 1500000
+BROKEN_i386=	error: static assertion failed due to requirement 'std::numeric_limits<unsigned int>::max() >= std::numeric_limits<unsigned long long>::max()': NCrystal is no longer supported on 32bit systems
+.endif
+
 post-install:
 	# strip binary
 	#@${STRIP_CMD} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/NCrystal/ncrystal_pyinst_data/lib/libNCrystal.so
 
 do-test:
 	@cd ${TEST_WRKSRC} && \
 		${SETENV} ${TEST_ENV} ${PYTHON_CMD} -m NCrystal.test all
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>