diff --git a/activesupport/lib/active_support/multibyte/chars.rb b/activesupport/lib/active_support/multibyte/chars.rb
index 1eb6e8748bb1c3f250cce970412ae90866bb5dc6..d6ccb4bac1cb0ab931ae1c15458996feded18b43 100644
--- a/activesupport/lib/active_support/multibyte/chars.rb
+++ b/activesupport/lib/active_support/multibyte/chars.rb
@@ -34,7 +34,6 @@ module Multibyte #:nodoc:
     #
     #   ActiveSupport::Multibyte.proxy_class = CharsForUTF32
     class Chars
-
       attr_reader :wrapped_string
       alias to_s wrapped_string
       alias to_str wrapped_string
@@ -45,14 +44,16 @@ def initialize(string)
           @wrapped_string = string
           @wrapped_string.force_encoding(Encoding::UTF_8) unless @wrapped_string.frozen?
         end
-
-        undef <=>
       else
         def initialize(string) #:nodoc:
           @wrapped_string = string
         end
       end
 
+      def <=>(other)
+        @wrapped_string <=> other
+      end
+
       # Forward all undefined methods to the wrapped string.
       def method_missing(method, *args, &block)
         if method.to_s =~ /!$/