diff --git a/app/models/journal.rb b/app/models/journal.rb
index 5d10ef8..e3de2b3 100644
--- a/app/models/journal.rb
+++ b/app/models/journal.rb
@@ -190,7 +190,7 @@ class Journal < ActiveRecord::Base
     if notify? && (Setting.notified_events.include?('issue_updated') ||
         (Setting.notified_events.include?('issue_note_added') && notes.present?) ||
         (Setting.notified_events.include?('issue_status_updated') && new_status.present?) ||
-        (Setting.notified_events.include?('issue_assigned_to_updated') && new_value_for('assigned_to_id').present?) ||
+        (Setting.notified_events.include?('issue_assigned_to_updated') && detail_for_attribute('assigned_to_id').present?) ||
         (Setting.notified_events.include?('issue_priority_updated') && new_value_for('priority_id').present?)
       )
       Mailer.deliver_issue_edit(self)