diff --git a/dev-ruby/msgpack/msgpack-1.8.0.ebuild b/dev-ruby/msgpack/msgpack-1.8.0.ebuild
index 1100da614f544..546f86ec4550d 100644
--- a/dev-ruby/msgpack/msgpack-1.8.0.ebuild
+++ b/dev-ruby/msgpack/msgpack-1.8.0.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-USE_RUBY="ruby31 ruby32 ruby33"
+USE_RUBY="ruby31 ruby32 ruby33 ruby34"
 
 RUBY_FAKEGEM_RECIPE_TEST="rspec3"
 RUBY_FAKEGEM_EXTRADOC="ChangeLog README.md"