diff --git a/math/py-GridDataFormats/Makefile b/math/py-GridDataFormats/Makefile
index 6c1347d75c23..2afd3b0582cd 100644
--- a/math/py-GridDataFormats/Makefile
+++ b/math/py-GridDataFormats/Makefile
@@ -1,28 +1,30 @@
 PORTNAME=	GridDataFormats
 DISTVERSION=	0.6.0
 CATEGORIES=	math python
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Handle data on a grid: NumPy n-dimensional arrays
 
+BROKEN=		does not fetch: Fetched file size mismatch (expected 2210700, actual 2210686)
+
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 RUN_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}scipy>0:science/py-scipy@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}six>0:devel/py-six@${PY_FLAVOR}
 TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pytest>0:devel/py-pytest@${PY_FLAVOR}
 
 USES=		python:3.6+
 USE_PYTHON=	distutils autoplist concurrent
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	MDAnalysis
 
 NO_ARCH=	yes
 
 do-test:
 	@cd ${WRKSRC} && ${SETENV} ${TEST_ENV} ${PYTHON_CMD} -m pytest
 
 .include <bsd.port.mk>