diff --git a/railties/lib/rails/generators/rails/app/templates/Gemfile b/railties/lib/rails/generators/rails/app/templates/Gemfile
index 5b7a653a09c4f..7c442d497e4a0 100644
--- a/railties/lib/rails/generators/rails/app/templates/Gemfile
+++ b/railties/lib/rails/generators/rails/app/templates/Gemfile
@@ -21,5 +21,7 @@ source 'https://rubygems.org'
 # Deploy with Capistrano
 # gem 'capistrano', group: :development
 
+<% unless defined?(JRUBY_VERSION) %>
 # To use debugger
 # gem 'debugger'
+<% end %>