diff --git a/devel/py-async_timeout/Makefile b/devel/py-async_timeout/Makefile
index 1bb60a3c3190..11682ed3525e 100644
--- a/devel/py-async_timeout/Makefile
+++ b/devel/py-async_timeout/Makefile
@@ -1,24 +1,30 @@
 PORTNAME=	async_timeout
 PORTVERSION=	4.0.2
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 DISTNAME=	async-timeout-${DISTVERSIONFULL}
 
 MAINTAINER=	bofh@FreeBSD.org
 COMMENT=	Timeout context manager for asyncio programs
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 TEST_DEPENDS=     ${PYTHON_PKGNAMEPREFIX}pytest>0:devel/py-pytest@${PY_FLAVOR}
 
 USES=		python:3.7+
 USE_PYTHON=	autoplist distutils
 
 NO_ARCH=	yes
 
+.include <bsd.port.pre.mk>
+
+.if ${PYTHON_REL} < 30800
+RUN_DEPENDS+=	${PYTHON_PKGNAMEPREFIX}typing-extensions>=3.6.5:devel/py-typing-extensions@${PY_FLAVOR}
+.endif
+
 do-test:
 	@cd ${WRKSRC} && ${PYTHON_CMD} ${PYDISTUTILS_SETUP} test
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>