diff --git a/dev-ruby/rdoc/rdoc-7.0.3.ebuild b/dev-ruby/rdoc/rdoc-7.0.3.ebuild
index a0da9b8612c7c..b56df4af40013 100644
--- a/dev-ruby/rdoc/rdoc-7.0.3.ebuild
+++ b/dev-ruby/rdoc/rdoc-7.0.3.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-USE_RUBY="ruby32 ruby33 ruby34"
+USE_RUBY="ruby32 ruby33 ruby34 ruby40"
 
 RUBY_FAKEGEM_RECIPE_DOC=""
 RUBY_FAKEGEM_DOCDIR="doc"