diff --git a/settings/Core.setting.php b/settings/Core.setting.php
index 3e74fe80aa37..0efc087dac79 100644
--- a/settings/Core.setting.php
+++ b/settings/Core.setting.php
@@ -974,6 +974,7 @@
     'type' => 'Array',
     'add' => '4.7',
     'is_domain' => 1,
+    'is_contact' => 0,
     'default' => array(),
     'title' => 'Do not notify assignees for',
     'help_text' => 'These activity types will be excluded from automated email notifications to assignees.',