diff --git a/dev-ruby/ostruct/ostruct-0.6.3.ebuild b/dev-ruby/ostruct/ostruct-0.6.3.ebuild
index 2ed729fa8f476..63e148427de2e 100644
--- a/dev-ruby/ostruct/ostruct-0.6.3.ebuild
+++ b/dev-ruby/ostruct/ostruct-0.6.3.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-USE_RUBY="ruby32 ruby33 ruby34"
+USE_RUBY="ruby32 ruby33 ruby34 ruby40"
 
 RUBY_FAKEGEM_BINWRAP=""
 RUBY_FAKEGEM_EXTRADOC="README.md"