diff --git a/blocks/comments/block_comments.php b/blocks/comments/block_comments.php
index 4caa8c863fa..c6c009045bf 100644
--- a/blocks/comments/block_comments.php
+++ b/blocks/comments/block_comments.php
@@ -55,10 +55,4 @@ class block_comments extends block_base {
         $this->content->footer = '';
         return $this->content;
     }
-    function instance_delete() {
-        global $DB, $PAGE;
-        //delete orphan records
-        $DB->delete_records('comments', array('contextid'=>$PAGE->context->id, 'commentarea'=>'page_comments', 'itemid'=>0));
-        return true;
-    }
 }