diff --git a/dev-ruby/thread_safe/thread_safe-0.3.6.ebuild b/dev-ruby/thread_safe/thread_safe-0.3.6.ebuild
index aa376e97c76f8..0d0a2b39e5f46 100644
--- a/dev-ruby/thread_safe/thread_safe-0.3.6.ebuild
+++ b/dev-ruby/thread_safe/thread_safe-0.3.6.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=5
 
-USE_RUBY="ruby21 ruby22 ruby23"
+USE_RUBY="ruby21 ruby22 ruby23 ruby24"
 
 RUBY_FAKEGEM_RECIPE_DOC="rdoc"
 RUBY_FAKEGEM_EXTRADOC="README.md"