Index: wp-includes/post-template.php
===================================================================
--- wp-includes/post-template.php	(revision 15261)
+++ wp-includes/post-template.php	(working copy)
@@ -135,7 +135,7 @@
  * @param int $id Optional. Post ID.
  */
 function the_guid( $id = 0 ) {
-	echo esc_url( get_the_guid($id) );
+	echo esc_url( get_the_guid( $id ) );
 }
 
 /**