diff --git a/devel/py-greenlet/Makefile b/devel/py-greenlet/Makefile
index bf0be9f0ad5a..e433e84e57fa 100644
--- a/devel/py-greenlet/Makefile
+++ b/devel/py-greenlet/Makefile
@@ -1,23 +1,26 @@
 PORTNAME=	greenlet
 PORTVERSION=	2.0.2
+PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Light-weight microthreads for Python
 WWW=		https://github.com/python-greenlet/greenlet
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 NOT_FOR_ARCHS=		mips mips64
 NOT_FOR_ARCHS_REASON=	greenlet needs to be ported to this platform
 
 USES=		python:3.5+
 USE_PYTHON=	autoplist concurrent distutils
 
+CPPFLAGS+=	-Dregister=
+
 post-install:
 	${FIND} ${STAGEDIR}${PYTHON_SITELIBDIR} -name '*.so' -exec ${STRIP_CMD} {} +
 
 .include <bsd.port.mk>