diff --git a/post.php b/post.php
index 0a7959c2..c2bd406d 100644
--- a/post.php
+++ b/post.php
@@ -221,7 +221,7 @@ function send_matrix_report(
 
     $end = strlen($post['body_nomarkup']) > $max_msg_len ? ' [...]' : '';
     $post_content = mb_substr($post['body_nomarkup'], 0, $max_msg_len) . $end;
-    $text_body = $reported_post_url . ($post['thread'] ? "#$post_id" : '') . " \nReason:\n" . $report_reason . " \nPost:\n" . $post_content;
+    $text_body = $reported_post_url . ($post['thread'] ? "#$id" : '') . " \nReason:\n" . $report_reason . " \nPost:\n" . $post_content;
 
     $random_transaction_id = mt_rand();
     $json_body = json_encode([