diff --git a/Gemfile b/Gemfile
index a2bc4dd1..6b57b859 100644
--- a/Gemfile
+++ b/Gemfile
@@ -64,6 +64,7 @@ if RUBY_ENGINE == "rbx"
   gem 'json'
   gem 'rubysl'
   gem 'rubysl-test-unit'
+  gem 'erubi'
 end
 
 platforms :jruby do