diff --git a/src/wp-includes/class-json.php b/src/wp-includes/class-json.php
index 147cdcb8cd..9d0f0adaad 100644
--- a/src/wp-includes/class-json.php
+++ b/src/wp-includes/class-json.php
@@ -121,6 +121,13 @@ define('SERVICES_JSON_USE_TO_JSON', 64);
  */
 class Services_JSON
 {
+   /**
+    * Object behavior flags.
+    *
+    * @var int
+    */
+   public $use;
+
    /**
     * constructs a new JSON instance
     *