diff --git a/dev-ruby/thread_safe/thread_safe-0.3.5.ebuild b/dev-ruby/thread_safe/thread_safe-0.3.5.ebuild
index ccfe4861042c8..66e4781febd47 100644
--- a/dev-ruby/thread_safe/thread_safe-0.3.5.ebuild
+++ b/dev-ruby/thread_safe/thread_safe-0.3.5.ebuild
@@ -4,7 +4,7 @@
 
 EAPI=5
 
-USE_RUBY="ruby20 ruby21 ruby22"
+USE_RUBY="ruby20 ruby21 ruby22 ruby23"
 
 RUBY_FAKEGEM_RECIPE_DOC="rdoc"