diff --git a/posting.php b/posting.php
index 194d1816d..dd4273aca 100644
--- a/posting.php
+++ b/posting.php
@@ -253,7 +253,9 @@ if (!empty($bb_cfg['tor_cannot_edit']) && $post_info['allow_reg_tracker'] && $po
 $anonymous_mode = $post_info['post_anonymous_mode'] ?? (bool)bf($userdata['user_opt'], 'user_opt', 'user_anonymous');
 $robots_indexing = $post_info['topic_allow_robots'] ?? true;
 if ($submit || $refresh) {
-    $anonymous_mode = !empty($_POST['anonymous']);
+    if (!IS_GUEST) {
+        $anonymous_mode = !empty($_POST['anonymous']);
+    }
     if (IS_AM) {
         $robots_indexing = !empty($_POST['robots']);
     }