diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index de5e0a8c..3aa98257 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -217,7 +217,7 @@ class AttachmentsController < ApplicationController
         if @file.container && current_user.logged?
           if @file.container.is_a?(Issue)
             course = @file.container.project
-            candown = course.member?(current_user)
+            candown = course.member?(current_user) || course.is_public
           elsif @file.container.is_a?(Journal)
             course = @file.container.issue.project
             candown = course.member?(current_user)