diff --git a/script/cache_critical_dns b/script/cache_critical_dns
index 3ce06c1dc95..613a3c7b2b5 100755
--- a/script/cache_critical_dns
+++ b/script/cache_critical_dns
@@ -34,6 +34,7 @@ def swap_address(hosts, name, ips)
       next if hostname == name
     end
     new_file << line
+    new_file << "\n"
   end
 
   ips.each do |ip|