diff --git a/devel/py-grpcio/Makefile b/devel/py-grpcio/Makefile
index d520cc2faba8..09ef72b7124b 100644
--- a/devel/py-grpcio/Makefile
+++ b/devel/py-grpcio/Makefile
@@ -1,29 +1,32 @@
 # Created by: vanilla@
 
 PORTNAME=	grpcio
 PORTVERSION=	1.42.0
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	vanilla@FreeBSD.org
 COMMENT=	HTTP/2-based RPC framework
 
 LICENSE=	APACHE20
 
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}protobuf>=3:devel/py-protobuf@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}six>1:devel/py-six@${PY_FLAVOR}
 LIB_DEPENDS=	libcares.so:dns/c-ares
 
 USES=		compiler:c++11-lib localbase:ldflags python:3.6+ ssl
-USE_PYTHON=	autoplist distutils
+USE_PYTHON=	autoplist cython distutils
 MAKE_ENV+=	GRPC_PYTHON_BUILD_SYSTEM_CARES=true \
 		GRPC_PYTHON_BUILD_SYSTEM_OPENSSL=true \
 		GRPC_PYTHON_BUILD_SYSTEM_ZLIB=true
 LDFLAGS+=	-lcares
 
+post-patch:
+	@${RM} ${WRKSRC}/src/python/grpcio/grpc/_cython/cygrpc.cpp
+
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/grpc/_cython/cygrpc*.so
 	${REINPLACE_CMD} -e 's|${PYTHONPREFIX_SITELIBDIR}/\(.*\)/grpcio/grpc/_cython/cygrpc${PYTHON_EXT_SUFFIX}.so|${PYTHONPREFIX_SITELIBDIR}/grpc/_cython/cygrpc${PYTHON_EXT_SUFFIX}.so|g' ${_PYTHONPKGLIST}
 
 .include <bsd.port.mk>