diff --git a/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb b/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
index 20bc0a7ad..acfc28c41 100644
--- a/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
+++ b/lib/plugins/acts_as_attachable/lib/acts_as_attachable.rb
@@ -219,11 +219,7 @@ module Redmine
 
               if a && !attachment['is_public_checkbox']
                 # 考虑到更新操作，所以全部设置为公开，私有项目、课程是不能访问的
-                if is_public
-                  a.is_public = true
-                else
-                  a.is_public = false
-                end
+                a.is_public = true
               elsif a && attachment['is_public_checkbox']
                 a.is_public = true
               end