diff --git a/dev-ruby/debug/debug-1.11.1.ebuild b/dev-ruby/debug/debug-1.11.1.ebuild
index a764e8b112129..86b2e0316e3b9 100644
--- a/dev-ruby/debug/debug-1.11.1.ebuild
+++ b/dev-ruby/debug/debug-1.11.1.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-USE_RUBY="ruby32 ruby33 ruby34"
+USE_RUBY="ruby32 ruby33 ruby34 ruby40"
 
 RUBY_FAKEGEM_EXTRADOC="TODO.md README.md"