Index: src/wp-includes/post.php
===================================================================
--- src/wp-includes/post.php	(revision 28742)
+++ src/wp-includes/post.php	(working copy)
@@ -5312,10 +5312,6 @@
 function get_lastpostmodified($timezone = 'server') {
 	$lastpostmodified = _get_last_post_time( $timezone, 'modified' );
 
-	$lastpostdate = get_lastpostdate($timezone);
-	if ( $lastpostdate > $lastpostmodified )
-		$lastpostmodified = $lastpostdate;
-
 	/**
 	 * Filter the date the last post was modified.
 	 *