diff --git a/lib/devise.rb b/lib/devise.rb
index 1c22351f..df02255f 100644
--- a/lib/devise.rb
+++ b/lib/devise.rb
@@ -87,7 +87,7 @@ module Devise
 
   # Store scopes mappings.
   mattr_accessor :mappings
-  @@mappings = {}
+  @@mappings = ActiveSupport::OrderedHash.new
 
   # Stores the chosen ORM.
   mattr_accessor :orm