diff --git a/activerecord/CHANGELOG b/activerecord/CHANGELOG
index b487f442b323bd103837185c0b153e8ef46f3d40..c7526beb831529b7242692578b5eaaea3eaebdd0 100644
--- a/activerecord/CHANGELOG
+++ b/activerecord/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Fixed that validations didn't respecting custom setting for too_short, too_long messages #1437 [Marcel Molina]
+
 * Fixed that clear_association_cache doesn't delete new associations on new records (so you can safely place new records in the session with Action Pack without having new associations wiped) #1494 [cluon]
 
 * Fixed that calling Model.find([]) returns [] and doesn't throw an exception #1379
diff --git a/activerecord/lib/active_record/validations.rb b/activerecord/lib/active_record/validations.rb
index d58502e98bd9300b4a46b890fa7a746d4032ca55..e42b306e109a8f66ee7db62419d2ea4544edded2 100755
--- a/activerecord/lib/active_record/validations.rb
+++ b/activerecord/lib/active_record/validations.rb
@@ -213,12 +213,6 @@ module ClassMethods
         :message => nil
       }.freeze
 
-      DEFAULT_SIZE_VALIDATION_OPTIONS = DEFAULT_VALIDATION_OPTIONS.merge(
-        :too_long => ActiveRecord::Errors.default_error_messages[:too_long],
-        :too_short => ActiveRecord::Errors.default_error_messages[:too_short],
-        :wrong_length => ActiveRecord::Errors.default_error_messages[:wrong_length]
-      ).freeze
-
       ALL_RANGE_OPTIONS = [ :is, :within, :in, :minimum, :maximum ].freeze
 
       def validate(*methods, &block)
@@ -404,7 +398,9 @@ def validates_presence_of(*attr_names)
       # method, proc or string should return or evaluate to a true or false value.
       def validates_length_of(*attrs)
         # Merge given options with defaults.
-        options = DEFAULT_SIZE_VALIDATION_OPTIONS.dup
+        options = {:too_long     => ActiveRecord::Errors.default_error_messages[:too_long],
+                   :too_short    => ActiveRecord::Errors.default_error_messages[:too_short],
+                   :wrong_length => ActiveRecord::Errors.default_error_messages[:wrong_length]}.merge(DEFAULT_VALIDATION_OPTIONS)
         options.update(attrs.pop.symbolize_keys) if attrs.last.is_a?(Hash)
 
         # Ensure that one and only one range option is specified.
diff --git a/activerecord/test/validations_test.rb b/activerecord/test/validations_test.rb
index 2cce21597ab94c84dc4c34a501d7029c360bd14a..2ff618b0e6bdf774f94cb00f863f7d06ce67bc1a 100755
--- a/activerecord/test/validations_test.rb
+++ b/activerecord/test/validations_test.rb
@@ -493,6 +493,15 @@ def test_validates_length_of_using_bignum
     end
   end
 
+  def test_validates_length_with_globaly_modified_error_message
+    ActiveRecord::Errors.default_error_messages[:too_short] = 'tu est trops petit hombre %d'
+    Topic.validates_length_of :title, :minimum => 10
+    t = Topic.create(:title => 'too short')
+    assert !t.valid?
+
+    assert_equal 'tu est trops petit hombre 10', t.errors['title']
+  end
+
   def test_validates_size_of_association
     assert_nothing_raised { Topic.validates_size_of :replies, :minimum => 1 }
     t = Topic.new('title' => 'noreplies', 'content' => 'whatever')