diff --git a/wp-includes/nav-menu-template.php b/wp-includes/nav-menu-template.php
index f3407b072..2b24b7484 100644
--- a/wp-includes/nav-menu-template.php
+++ b/wp-includes/nav-menu-template.php
@@ -73,7 +73,7 @@ class Walker_Nav_Menu extends Walker {
 		$classes = empty( $item->classes ) ? array() : (array) $item->classes;
 		$classes[] = 'menu-item-' . $item->ID;
 
-		$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) );
+		$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
 		$class_names = ' class="' . esc_attr( $class_names ) . '"';
 
 		$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );