Using new hash syntax in wrap_parameters initializer under Ruby 1.9

railties/lib/rails/generators/rails/app/templates/config/initializers/wrap_parameters.rb.tt

@@ -4,7 +4,7 @@
 # which will be enabled by default in the upcoming version of Ruby on Rails.
 
 # Enable parameter wrapping for JSON. You can disable this by setting :format to an empty array.
-ActionController::Base.wrap_parameters :format => [:json]
+ActionController::Base.wrap_parameters <%= key_value :format, "[:json]" %>
 
 # Disable root element in JSON by default.
 if defined?(ActiveRecord)