diff --git a/app/models/metadata_template.rb b/app/models/metadata_template.rb
index 823443d2..89fd8315 100644
--- a/app/models/metadata_template.rb
+++ b/app/models/metadata_template.rb
@@ -38,18 +38,10 @@ MetadataTemplate = Struct.new(:site, :document, :name, :label, :type,
     "#{cache_key}-#{cache_version}"
   end
 
-  # XXX: Deberíamos sanitizar durante la asignación?
-  def value=(new_value)
-    @value_was = value
-    self[:value] = new_value
-  end
-
   # Siempre obtener el valor actual y solo obtenerlo del documento una
   # vez.
   def value_was
-    return @value_was if instance_variable_defined? '@value_was'
-
-    @value_was = document_value
+    @value_was ||= document_value.nil? ? default_value : document_value
   end
 
   def changed?