diff --git a/activesupport/lib/active_support/ordered_hash.rb b/activesupport/lib/active_support/ordered_hash.rb
index fed8094a24..33fd2a29b9 100644
--- a/activesupport/lib/active_support/ordered_hash.rb
+++ b/activesupport/lib/active_support/ordered_hash.rb
@@ -57,6 +57,10 @@ module ActiveSupport
         self
       end
 
+      def to_a
+        @keys.map { |key| [ key, self[key] ] }
+      end
+
       def each_key
         @keys.each { |key| yield key }
       end
diff --git a/activesupport/test/ordered_hash_test.rb b/activesupport/test/ordered_hash_test.rb
index 7cd8c8a8f4..6fccbbdc41 100644
--- a/activesupport/test/ordered_hash_test.rb
+++ b/activesupport/test/ordered_hash_test.rb
@@ -51,6 +51,10 @@ class OrderedHashTest < Test::Unit::TestCase
     assert_same @ordered_hash, @ordered_hash.to_hash
   end
 
+  def test_to_a
+    assert_equal @keys.zip(@values), @ordered_hash.to_a
+  end
+
   def test_has_key
     assert_equal true, @ordered_hash.has_key?('blue')
     assert_equal true, @ordered_hash.key?('blue')