Index: wp-admin/includes/comment.php
===================================================================
--- wp-admin/includes/comment.php	(revision 13290)
+++ wp-admin/includes/comment.php	(working copy)
@@ -150,16 +150,7 @@
  */
 function floated_admin_avatar( $name ) {
 	global $comment;
-
-	$id = $avatar = false;
-	if ( $comment->comment_author_email )
-		$id = $comment->comment_author_email;
-	if ( $comment->user_id )
-		$id = $comment->user_id;
-
-	if ( $id )
-		$avatar = get_avatar( $id, 32 );
-
+	$avatar = get_avatar( $comment, 32 );
 	return "$avatar $name";
 }