diff --git a/dev-ruby/stringio/stringio-3.1.2.ebuild b/dev-ruby/stringio/stringio-3.1.2.ebuild
index 4bc814dc1205c..6a7c4d3d60960 100644
--- a/dev-ruby/stringio/stringio-3.1.2.ebuild
+++ b/dev-ruby/stringio/stringio-3.1.2.ebuild
@@ -2,7 +2,7 @@
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
-USE_RUBY="ruby31 ruby32 ruby33"
+USE_RUBY="ruby31 ruby32 ruby33 ruby34"
 
 RUBY_FAKEGEM_EXTRADOC="README.md"
 RUBY_FAKEGEM_EXTENSIONS=(ext/stringio/extconf.rb)