Ticket #10361: 10361.diff

wp-includes/post-template.php

@@ -427 +427 @@
 
                 $classes[] = 'page-id-' . $pageID;
 
-                if ( $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'page' LIMIT 1", $pageID) ) )
+                if ( empty($wp_query->post->ancestors) )
                         $classes[] = 'page-parent';
 
                 if ( $wp_query->post->post_parent ) {