diff --git a/lib/mongoid/grid_fs.rb b/lib/mongoid/grid_fs.rb
index 289bffb..9acbe1f 100644
--- a/lib/mongoid/grid_fs.rb
+++ b/lib/mongoid/grid_fs.rb
@@ -186,6 +186,7 @@ def [](filename)
           file_model
             .where(filename: filename.to_s)
             .order_by(uploadDate: :desc)
+            .extras(hint: { filename: 1 })
             .limit(1)
             .first
         end