diff --git a/devel/py-ratelimiter/Makefile b/devel/py-ratelimiter/Makefile
index ab635b32b794..9160a11f28bc 100644
--- a/devel/py-ratelimiter/Makefile
+++ b/devel/py-ratelimiter/Makefile
@@ -1,25 +1,26 @@
 # Created by: Po-Chuan Hsieh <sunpoet@FreeBSD.org>
 
 PORTNAME=	ratelimiter
 PORTVERSION=	1.2.0
 DISTVERSIONSUFFIX=	.post0
 PORTREVISION=	1
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sunpoet@FreeBSD.org
 COMMENT=	Simple python rate limiting object
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pytest>=3.0:devel/py-pytest@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}pytest-asyncio>=0:devel/py-pytest-asyncio@${PY_FLAVOR}
 
 USES=		python:3.6+
 USE_PYTHON=	autoplist concurrent distutils
 
 NO_ARCH=	yes
+USE_LOCALE=	en_US.UTF-8 # Python 3.6
 
 .include <bsd.port.mk>