Index: head/sysutils/py-filelock/Makefile
===================================================================
--- head/sysutils/py-filelock/Makefile	(revision 502084)
+++ head/sysutils/py-filelock/Makefile	(revision 502085)
@@ -1,20 +1,20 @@
 # $FreeBSD$
 
 PORTNAME=	filelock
 DISTVERSION=	3.0.11
 CATEGORIES=	sysutils python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Platform independent file lock
 
 LICENSE=	PD
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		python
+USES=		python:3.6+ # fails on 27: https://github.com/benediktschmitt/py-filelock/issues/53
 USE_PYTHON=	autoplist distutils
 
 NO_ARCH=	yes
 
 .include <bsd.port.mk>