diff --git a/wp-content/themes/twentyeleven/functions.php b/wp-content/themes/twentyeleven/functions.php
index 7a8200f4c8..1fc8e659e7 100644
--- a/wp-content/themes/twentyeleven/functions.php
+++ b/wp-content/themes/twentyeleven/functions.php
@@ -445,11 +445,11 @@ if ( ! function_exists( 'twentyeleven_content_nav' ) ) :
 /**
  * Display navigation to next/previous pages when applicable
  */
-function twentyeleven_content_nav( $nav_id ) {
+function twentyeleven_content_nav( $html_id ) {
 	global $wp_query;
 
 	if ( $wp_query->max_num_pages > 1 ) : ?>
-		<nav id="<?php echo $nav_id; ?>">
+		<nav id="<?php echo esc_attr( $html_id ); ?>">
 			<h3 class="assistive-text"><?php _e( 'Post navigation', 'twentyeleven' ); ?></h3>
 			<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">&larr;</span> Older posts', 'twentyeleven' ) ); ?></div>
 			<div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">&rarr;</span>', 'twentyeleven' ) ); ?></div>