diff --git a/lang/kefir/Makefile b/lang/kefir/Makefile
index 66a3974bbd07..a9f14377d04b 100644
--- a/lang/kefir/Makefile
+++ b/lang/kefir/Makefile
@@ -1,30 +1,33 @@
 PORTNAME=	kefir
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.5.0
 CATEGORIES=	lang devel
 MASTER_SITES=	https://git.sr.ht/~jprotopopov/kefir/archive/${DISTVERSIONFULL}.tar.gz?dummy=/
 
 MAINTAINER=	fuz@FreeBSD.org
 COMMENT=	C17/C23 compiler
 WWW=		https://kefir.protopopov.lv/
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 ONLY_FOR_ARCHS=	amd64
 ONLY_FOR_ARCHS_REASON=	compiler targets amd64 only right now
 
 BUILD_DEPENDS=	as:devel/binutils \
 		grealpath:sysutils/coreutils
 RUN_DEPENDS=	as:devel/binutils
 TEST_DEPENDS=	bash:shells/bash
 
 USES=		gmake
 USE_LDCONFIG=	yes
-TEST_TARGET= 	test
+
 MAKE_ARGS=	prefix=${PREFIX}
 .if "${WITH_DEBUG}" == "yes"
 MAKE_ARGS+=	PROFILE=debug
 .endif
 
+TEST_ENV=	LC_ALL=C.UTF-8
+TEST_TARGET= 	test
+
 .include <bsd.port.mk>