diff --git a/app/models/issue.rb b/app/models/issue.rb
index 507574de7..9ac09f44a 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -56,7 +56,7 @@ class Issue < ActiveRecord::Base
 
   DONE_RATIO_OPTIONS = %w(issue_field issue_status)
 
-  attr_accessor :deleted_attachment_ids
+  attr_writer :deleted_attachment_ids
   attr_reader :current_journal
   delegate :notes, :notes=, :private_notes, :private_notes=, :to => :current_journal, :allow_nil => true