diff --git a/library/ajax/thanks.php b/library/ajax/thanks.php
index 3f55f1c4f..1fd9a83a4 100644
--- a/library/ajax/thanks.php
+++ b/library/ajax/thanks.php
@@ -48,7 +48,7 @@ switch ($mode) {
         DB()->query('INSERT IGNORE INTO ' . BB_THX . " ($columns) VALUES ($values)");
 
         // Limit voters per topic
-        $thanks_count = DB()->fetch_row('SELECT COUNT(*) FROM ' . BB_THX . " WHERE topic_id = $topic_id");
+        $thanks_count = DB()->fetch_row('SELECT COUNT(*) as thx FROM ' . BB_THX . " WHERE topic_id = $topic_id")['thx'];
         if ($thanks_count > (int)$bb_cfg['tor_thank_limit_per_topic']) {
             DB()->query('DELETE FROM ' . BB_THX . " WHERE topic_id = $topic_id ORDER BY time ASC LIMIT 1");
         }