diff --git a/Michelf/Markdown.php b/Michelf/Markdown.php
index f8f4aa8..49d9809 100644
--- a/Michelf/Markdown.php
+++ b/Michelf/Markdown.php
@@ -2937,7 +2937,6 @@ class _MarkdownExtra_TmpImpl extends \Michelf\Markdown {
 			$text .= "<hr". $this->empty_element_suffix ."\n";
 			$text .= "<ol>\n\n";
 			
-			$attr = " rev=\"footnote\"";
 			if ($this->fn_backlink_class != "") {
 				$class = $this->fn_backlink_class;
 				$class = $this->encodeAttribute($class);