diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index e0844ab4c..cef2a1785 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -776,7 +776,7 @@ class CoursesController < ApplicationController
       name = attachment.disk_filename
       if name.split(".").last == "xls"
         begin
-          attachment_folder = Rails.configuration.educoder['attachment_folder']
+          attachment_folder = edu_setting('attachment_folder')
           full_path = "#{attachment_folder}/#{path}/#{name}"
           xls = Roo::Spreadsheet.open(full_path, extension: :xls)
           worksheet = xls.sheet(0)