diff --git a/dev-ruby/prism/prism-1.7.0.ebuild b/dev-ruby/prism/prism-1.7.0.ebuild
index d6f081205cb2b..3744f20e67e6d 100644
--- a/dev-ruby/prism/prism-1.7.0.ebuild
+++ b/dev-ruby/prism/prism-1.7.0.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/prism/extconf.rb )