diff --git a/dev-ruby/bigdecimal/bigdecimal-4.0.1.ebuild b/dev-ruby/bigdecimal/bigdecimal-4.0.1.ebuild
index 0fb073ca8e074..6e7c16973ff77 100644
--- a/dev-ruby/bigdecimal/bigdecimal-4.0.1.ebuild
+++ b/dev-ruby/bigdecimal/bigdecimal-4.0.1.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-USE_RUBY="ruby32 ruby33 ruby34"
+USE_RUBY="ruby32 ruby33 ruby34 ruby40"
 
 RUBY_FAKEGEM_BINWRAP=""
 RUBY_FAKEGEM_EXTENSIONS=(ext/bigdecimal/extconf.rb)