diff --git a/app/models/metadata_template.rb b/app/models/metadata_template.rb
index 8fa5a97..05db25f 100644
--- a/app/models/metadata_template.rb
+++ b/app/models/metadata_template.rb
@@ -168,7 +168,7 @@ MetadataTemplate = Struct.new(:site, :document, :name, :label, :type,
   end
 
   def allowed_attributes
-    @allowed_attributes ||= %w[style href src alt controls data-align].freeze
+    @allowed_attributes ||= %w[style href src alt controls data-align id].freeze
   end
 
   def allowed_tags