Index: wp-includes/post-template.php
===================================================================
--- wp-includes/post-template.php	(revision 17545)
+++ wp-includes/post-template.php	(working copy)
@@ -640,7 +640,7 @@
 				$j = str_replace('%',$i,$pagelink);
 				$output .= ' ';
 				if ( ($i != $page) || ((!$more) && ($page==1)) ) {
-					$output .= _wp_link_page($i);
+					$output .= '<a href="' . esc_url( get_multipage_link( $i ) ) . '">';
 				}
 				$output .= $link_before . $j . $link_after;
 				if ( ($i != $page) || ((!$more) && ($page==1)) )
@@ -652,12 +652,12 @@
 				$output .= $before;
 				$i = $page - 1;
 				if ( $i && $more ) {
-					$output .= _wp_link_page($i);
+					$output .= '<a href="' . esc_url( get_multipage_link( $i ) ) . '">';
 					$output .= $link_before. $previouspagelink . $link_after . '</a>';
 				}
 				$i = $page + 1;
 				if ( $i <= $numpages && $more ) {
-					$output .= _wp_link_page($i);
+					$output .= '<a href="' . esc_url( get_multipage_link( $i ) ) . '">';
 					$output .= $link_before. $nextpagelink . $link_after . '</a>';
 				}
 				$output .= $after;
@@ -671,32 +671,6 @@
 	return $output;
 }
 
-/**
- * Helper function for wp_link_pages().
- *
- * @since 3.1.0
- * @access private
- *
- * @param int $i Page number.
- * @return string Link.
- */
-function _wp_link_page( $i ) {
-	global $post, $wp_rewrite;
-
-	if ( 1 == $i ) {
-		$url = get_permalink();
-	} else {
-		if ( '' == get_option('permalink_structure') || in_array($post->post_status, array('draft', 'pending')) )
-			$url = add_query_arg( 'page', $i, get_permalink() );
-		elseif ( 'page' == get_option('show_on_front') && get_option('page_on_front') == $post->ID )
-			$url = trailingslashit(get_permalink()) . user_trailingslashit("$wp_rewrite->pagination_base/" . $i, 'single_paged');
-		else
-			$url = trailingslashit(get_permalink()) . user_trailingslashit($i, 'single_paged');
-	}
-
-	return '<a href="' . esc_url( $url ) . '">';
-}
-
 //
 // Post-meta: Custom per-post fields.
 //
Index: wp-includes/link-template.php
===================================================================
--- wp-includes/link-template.php	(revision 17545)
+++ wp-includes/link-template.php	(working copy)
@@ -1532,6 +1532,31 @@
 }
 
 /**
+ * Retrieve link to a multipage part.
+ *
+ * @since 3.2.0
+ *
+ * @param int $page Optional.
+ * @return string
+ */
+function get_multipage_link( $page = 1 ) {
+	global $post, $wp_rewrite;
+
+	if ( 1 == $page ) {
+		$url = get_permalink();
+	} else {
+		if ( '' == get_option('permalink_structure') || in_array( $post->post_status, array( 'draft', 'pending') ) )
+			$url = add_query_arg( 'page', $page, get_permalink() );
+		elseif ( 'page' == get_option( 'show_on_front' ) && get_option('page_on_front') == $post->ID )
+			$url = trailingslashit( get_permalink() ) . user_trailingslashit( $wp_rewrite->pagination_base . "/$page", 'single_paged' );
+		else
+			$url = trailingslashit( get_permalink() ) . user_trailingslashit( $page, 'single_paged' );
+	}
+
+	return $url;
+}
+
+/**
  * Retrieve next posts pages link.
  *
  * Backported from 2.1.3 to 2.0.10.