diff --git a/app/controllers/fluentd/settings_controller.rb b/app/controllers/fluentd/settings_controller.rb
index c45618f..3fad700 100644
--- a/app/controllers/fluentd/settings_controller.rb
+++ b/app/controllers/fluentd/settings_controller.rb
@@ -6,7 +6,7 @@ class Fluentd::SettingsController < ApplicationController
   before_action :set_config, only: [:show, :edit, :update]
 
   def show
-    @backup_files = @fluentd.agent.backup_files_in_new_order[0..4].map do |file_path|
+    @backup_files = @fluentd.agent.backup_files_in_new_order.first(5).map do |file_path|
       Fluentd::Setting::BackupFile.new(file_path)
     end