diff --git a/app/models/client.rb b/app/models/client.rb
index d7ed71c5e..f686c57cf 100644
--- a/app/models/client.rb
+++ b/app/models/client.rb
@@ -698,7 +698,7 @@ def self.export_doi_counts(query: nil)
 
     logger.warn "Found #{csv.size} repositories with missing DOIs."
 
-    csv.join("\n")
+    csv.join("")
   end
 
   protected