Index: wp-includes/post-template.php
===================================================================
--- wp-includes/post-template.php	(revision 18190)
+++ wp-includes/post-template.php	(working copy)
@@ -684,7 +684,7 @@
  * @return string Link.
  */
 function _wp_link_page( $i ) {
-	global $post, $wp_rewrite;
+	global $post, $wp_rewrite, $preview;
 
 	if ( 1 == $i ) {
 		$url = get_permalink();
@@ -696,6 +696,9 @@
 		else
 			$url = trailingslashit(get_permalink()) . user_trailingslashit($i, 'single_paged');
 	}
+	
+	if( $preview )
+		$url = add_query_arg( array( 'preview' => 'true', 'preview_id' => $post->ID, 'preview_nonce' => wp_create_nonce( 'post_preview_' . $post->ID ) ), $url );
 
 	return '<a href="' . esc_url( $url ) . '">';
 }