1 files changed, 6 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/ordered_options.rb b/activesupport/lib/active_support/ordered_options.rb
index 2b67e72cff..99c6c5a0c0 100644
--- a/activesupport/lib/active_support/ordered_options.rb
+++ b/activesupport/lib/active_support/ordered_options.rb
@@ -36,8 +36,12 @@ module ActiveSupport #:nodoc:
   end
 
   class InheritableOptions < OrderedOptions
-    def initialize(parent)
-      super() { |h,k| parent[k] }
+    def initialize(parent = nil)
+      if parent
+        super() { |h,k| parent[k] }
+      else
+        super()
+      end
     end
 
     def inheritable_copy