diff --git a/admin/admin_log.php b/admin/admin_log.php
index 01dbba373..f5c665187 100644
--- a/admin/admin_log.php
+++ b/admin/admin_log.php
@@ -235,6 +235,7 @@ if ($log_rowset) {
             case $log_type['mod_post_pin']:
             case $log_type['mod_post_unpin']:
             case $log_type['mod_topic_split']:
+            case $log_type['mod_topic_attach_updated']:
                 // topic_title
                 if (!empty($row['log_topic_title'])) {
                     $topic_title = $row['log_topic_title'];
diff --git a/src/Legacy/LogAction.php b/src/Legacy/LogAction.php
index e4af99bb7..4b11ad65e 100644
--- a/src/Legacy/LogAction.php
+++ b/src/Legacy/LogAction.php
@@ -35,6 +35,7 @@ class LogAction
         'mod_topic_tor_unregister' => 17,
         'mod_topic_tor_register' => 18,
         'mod_topic_tor_delete' => 19,
+        'mod_topic_attach_updated' => 20,
     ];
     public $log_type_select = [];
     public $log_disabled = false;