diff --git src/wp-admin/includes/media.php src/wp-admin/includes/media.php
index d9dd1e6..0a1d8f3 100644
--- src/wp-admin/includes/media.php
+++ src/wp-admin/includes/media.php
@@ -121,11 +121,7 @@ function get_image_send_to_editor( $id, $caption, $title, $align, $url = '', $re
 
 	$html = get_image_tag($id, $alt, '', $align, $size);
 
-	if ( ! $rel ) {
-		$rel = ' rel="attachment wp-att-' . esc_attr( $id ) . '"';
-	} else {
-		$rel = ' rel="' . esc_attr( $rel ) . '"';
-	}
+	$rel = $rel ? ' rel="' . esc_attr( $rel ) . '"' :  '';
 
 	if ( $url )
 		$html = '<a href="' . esc_attr($url) . "\"$rel>$html</a>";