diff --git a/devel/rubygem-tzinfo/Makefile b/devel/rubygem-tzinfo/Makefile
index 147fdd5e1fac..009c920ff206 100644
--- a/devel/rubygem-tzinfo/Makefile
+++ b/devel/rubygem-tzinfo/Makefile
@@ -3,6 +3,7 @@
 
 PORTNAME=	tzinfo
 PORTVERSION=	1.2.2
+PORTREVISION=	1
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 
@@ -11,6 +12,8 @@ COMMENT=	Daylight-savings aware timezone support for Ruby
 
 LICENSE=	MIT
 
+RUN_DEPENDS=	rubygem-thread_safe1>=0.1:${PORTSDIR}/devel/rubygem-thread_safe1
+
 USE_RUBY=	yes
 USE_RUBYGEMS=	yes
 RUBYGEM_AUTOPLIST=	yes