Index: wp-login.php
===================================================================
--- wp-login.php	(revision 29740)
+++ wp-login.php	(working copy)
@@ -391,7 +391,7 @@
 	 * @param string $message Default mail message.
 	 * @param string $key     The activation key.
 	 */
-	$message = apply_filters( 'retrieve_password_message', $message, $key );
+	$message = apply_filters( 'retrieve_password_message', $message, $key, $user_login );
 
 	if ( $message && !wp_mail( $user_email, wp_specialchars_decode( $title ), $message ) )
 		wp_die( __('The e-mail could not be sent.') . "<br />\n" . __('Possible reason: your host may have disabled the mail() function.') );