diff --git a/app/models/doi.rb b/app/models/doi.rb
index e61df884a..bf297324e 100644
--- a/app/models/doi.rb
+++ b/app/models/doi.rb
@@ -250,7 +250,7 @@ def self.index_by_day(options={})
 
     logger = Logger.new(STDOUT)
 
-    Doi.where("created >= ?", from_date.strftime("%F") + " 00:00:00").where("created < ?", until_date.strftime("%F") + " 00:00:00").where("updated > indexed").find_in_batches(batch_size: 25) do |dois|
+    Doi.where("created >= ?", from_date.strftime("%F") + " 00:00:00").where("created < ?", until_date.strftime("%F") + " 00:00:00").where("updated > indexed").find_in_batches(batch_size: 10) do |dois|
       response = Doi.__elasticsearch__.client.bulk \
         index:   Doi.index_name,
         type:    Doi.document_type,