diff --git a/dev-ruby/test-unit-ruby-core/test-unit-ruby-core-1.0.14.ebuild b/dev-ruby/test-unit-ruby-core/test-unit-ruby-core-1.0.14.ebuild
index 36a6db02ec8ca..2657f6e411bca 100644
--- a/dev-ruby/test-unit-ruby-core/test-unit-ruby-core-1.0.14.ebuild
+++ b/dev-ruby/test-unit-ruby-core/test-unit-ruby-core-1.0.14.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-USE_RUBY="ruby32 ruby33 ruby34"
+USE_RUBY="ruby32 ruby33 ruby34 ruby40"
 
 RUBY_FAKEGEM_RECIPE_TEST="none"