diff --git a/devel/py-frozenlist/Makefile b/devel/py-frozenlist/Makefile
index 202bdd48c7c4..cbec97351181 100644
--- a/devel/py-frozenlist/Makefile
+++ b/devel/py-frozenlist/Makefile
@@ -1,19 +1,22 @@
 PORTNAME=	frozenlist
 PORTVERSION=	1.3.0
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	python@FreeBSD.org
 COMMENT=	List-like structure which implements collections.abc.MutableSequence
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		gettext-runtime python:3.7+
-USE_PYTHON=	autoplist distutils
+USE_PYTHON=	autoplist cython distutils
+
+pre-configure:
+	@cd ${WRKSRC} && ${RM} frozenlist/_frozenlist.c && cython-${PYTHON_VER} -3 -I frozenlist -o frozenlist/_frozenlist.c frozenlist/_frozenlist.pyx
 
 post-install:
 	${FIND} ${STAGEDIR}${PYTHON_SITELIBDIR} -name '*.so' -exec ${STRIP_CMD} {} +
 
 .include <bsd.port.mk>