diff --git a/textproc/py-openstep-plist/Makefile b/textproc/py-openstep-plist/Makefile
index 466dbab48a7c..5bb152d20dc8 100644
--- a/textproc/py-openstep-plist/Makefile
+++ b/textproc/py-openstep-plist/Makefile
@@ -1,25 +1,27 @@
 PORTNAME=	openstep-plist
 PORTVERSION=	0.3.1
 CATEGORIES=	textproc python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 DISTNAME=	openstep_plist-${PORTVERSION}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	ASCII plist parser written in Cython
 WWW=		https://github.com/fonttools/openstep-plist
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+BROKEN=		Backend subprocess exited when trying to invoke build_wheel
+
 BUILD_DEPENDS=	${PYTHON_PKGNAMEPREFIX}setuptools>=0:devel/py-setuptools@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}setuptools_scm>=0:devel/py-setuptools_scm@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}wheel>=0:devel/py-wheel@${PY_FLAVOR}
 
 USES=		python
 USE_PYTHON=	autoplist concurrent cython pep517
 
 post-install:
 	${FIND} ${STAGEDIR}${PYTHON_SITELIBDIR} -name '*.so' -exec ${STRIP_CMD} {} +
 
 .include <bsd.port.mk>