diff --git a/activerecord/lib/active_record.rb b/activerecord/lib/active_record.rb
index 08b6b19f7f..bc27d17ccd 100644
--- a/activerecord/lib/active_record.rb
+++ b/activerecord/lib/active_record.rb
@@ -82,6 +82,6 @@ require 'active_record/connection_adapters/abstract_adapter'
 require 'active_record/schema_dumper'
 
 I18n.backend.populate do
-  I18n.load_translations File.dirname(__FILE__) + '/active_record/locale/en-US.rb'
+  I18n.load_translations File.dirname(__FILE__) + '/active_record/locale/en-US.yml'
 end
 
diff --git a/activerecord/lib/active_record/locale/en-US.yml b/activerecord/lib/active_record/locale/en-US.yml
new file mode 100644
index 0000000000..8148f31a81
--- /dev/null
+++ b/activerecord/lib/active_record/locale/en-US.yml
@@ -0,0 +1,33 @@
+en-US:
+  activerecord:
+    errors:
+      # The values :model, :attribute and :value are always available for interpolation
+      # The value :count is available when applicable. Can be used for pluralization.
+      messages:
+        inclusion: "is not included in the list"
+        exclusion: "is reserved"
+        invalid: "is invalid"
+        confirmation: "doesn't match confirmation"
+        accepted: "must be accepted"
+        empty: "can't be empty"
+        blank: "can't be blank"
+        too_long: "is too long (maximum is {{count}} characters)"
+        too_short: "is too short (minimum is {{count}} characters)"
+        wrong_length: "is the wrong length (should be {{count}} characters)"
+        taken: "has already been taken"
+        not_a_number: "is not a number"
+        greater_than: "must be greater than {{count}}"
+        greater_than_or_equal_to: "must be greater than or equal to {{count}}"
+        equal_to: "must be equal to {{count}}"
+        less_than: "must be less than {{count}}"
+        less_than_or_equal_to: "must be less than or equal to {{count}}"
+        odd: "must be odd"
+        even: "must be even"
+        # Append your own errors here or at the model/attributes scope.
+
+      models:
+        # Overrides default messages
+      
+      attributes:
+        # Overrides model and default messages.
+
diff --git a/activerecord/test/cases/validations_i18n_test.rb b/activerecord/test/cases/validations_i18n_test.rb
index 469e9d6c03..96af3b17a6 100644
--- a/activerecord/test/cases/validations_i18n_test.rb
+++ b/activerecord/test/cases/validations_i18n_test.rb
@@ -11,7 +11,7 @@ class ActiveRecordValidationsI18nTests < Test::Unit::TestCase
   
   def teardown
     reset_callbacks Topic
-    I18n.load_translations File.dirname(__FILE__) + '/../../lib/active_record/locale/en-US.rb'
+    I18n.load_translations File.dirname(__FILE__) + '/../../lib/active_record/locale/en-US.yml'
   end
   
   def unique_topic