diff --git a/devel/R-cran-timechange/Makefile b/devel/R-cran-timechange/Makefile
index 8c5320be30c0..dfb167b2cb33 100644
--- a/devel/R-cran-timechange/Makefile
+++ b/devel/R-cran-timechange/Makefile
@@ -1,21 +1,23 @@
 PORTNAME=	timechange
 DISTVERSION=	0.4.0
 CATEGORIES=	devel
 DISTNAME=	${PORTNAME}_${DISTVERSION}
 
 MAINTAINER=	eduardo@FreeBSD.org
 COMMENT=	Efficient Manipulation of Date-Times
 WWW=		https://cran.r-project.org/package=timechange
 
 LICENSE=	GPLv3
 
 CRAN_DEPENDS=	R-cran-cpp11>=0.2.7:devel/R-cran-cpp11
 BUILD_DEPENDS=	${CRAN_DEPENDS}
 RUN_DEPENDS=	${CRAN_DEPENDS}
 TEST_DEPENDS=	R-cran-testthat>0:devel/R-cran-testthat
 
 USES=		cran:auto-plist,compiles
 
-# Tests need /etc/localtime symlink configured
+# Tests need a valid Sys.timezone(); poudriere jails have no /etc/localtime.
+# MAKE_ENV as cran.mk's do-test does not honour TEST_ENV
+MAKE_ENV+=	TZ=UTC
 
 .include <bsd.port.mk>