diff --git a/app/models/research/journal/article.rb b/app/models/research/journal/article.rb
index f4df5a5743c10111919288082fae4499a6f418c9..17fe5d9fb2d3d1608dddf31d38f6ffe5eb068168 100644
--- a/app/models/research/journal/article.rb
+++ b/app/models/research/journal/article.rb
@@ -90,8 +90,8 @@ class Research::Journal::Article < ApplicationRecord
     ).ordered.last
   end
 
-  def blob_ids
-    [pdf&.blob_id]
+  def explicit_blob_ids
+    super.concat [pdf&.blob_id]
   end
 
   def set_published_at