diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 4d92808d4..8c060bfbf 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -2098,7 +2098,7 @@ module ApplicationHelper
   def attachment_history_candown attachment_history
     if attachment_history.container_type == "Course"
       course = Course.find(attachment_history.container_id)
-      candown = User.current.member_of?(course) || (course.is_public && attachment_history.is_public == 1)
+      candown = User.current.member_of_course?(course) || (course.is_public && attachment_history.is_public == 1)
     elsif attachment_history.container_type == "Project"
       project = Project.find(attachment_history.container_id)
       candown = User.current.member_of?(project) || (project.is_public && attachment_history.is_public == 1)