diff --git a/app/models/metadata_path.rb b/app/models/metadata_path.rb
index 05e3ed4..474ddee 100644
--- a/app/models/metadata_path.rb
+++ b/app/models/metadata_path.rb
@@ -24,7 +24,7 @@ class MetadataPath < MetadataTemplate
   private
 
   def ext
-    document.extname.blank? ? '.markdown' : document.extname
+    document.data['ext'].blank? ? '.markdown' : document.data['ext']
   end
 
   def lang
diff --git a/test/controllers/posts_controller_test.rb b/test/controllers/posts_controller_test.rb
index 93b6e8e..684818b 100644
--- a/test/controllers/posts_controller_test.rb
+++ b/test/controllers/posts_controller_test.rb
@@ -143,7 +143,7 @@ class PostsControllerTest < ActionDispatch::IntegrationTest
   end
 
   test 'se pueden reordenar' do
-    lang = :es
+    lang = I18n.available_locales.sample
     posts = @site.posts(lang: lang)
     reorder = posts.each_index.to_a.shuffle