Index: wp-includes/nav-menu-template.php
===================================================================
--- wp-includes/nav-menu-template.php	(révision 13591)
+++ wp-includes/nav-menu-template.php	(copie de travail)
@@ -116,7 +116,7 @@
 		$menu_item = wp_setup_nav_menu_item( $menu_item );
 		
 		$maybe_value = 'frontend' == $args->type ? '' : ' value="'. $menu_item->ID .'"';
-		$classes = 'frontend' == $args->type ? 'class="menu-item-'. $menu_item->type . $menu_item->li_class .'"' : '';
+		$classes = 'frontend' == $args->type ? ' class="menu-item-'. $menu_item->type . $menu_item->li_class .'"' : '';
 		
 		$nav_menu .= '<li id="menu-item-'. $menu_item->ID .'"'. $maybe_value . $classes .'>';
 		$nav_menu .= wp_get_nav_menu_item( $menu_item, $args->type, $args );