diff --git a/wp-includes/class-wp-customize-setting.php b/wp-includes/class-wp-customize-setting.php
index 3642532..f8f9ce0 100644
--- a/wp-includes/class-wp-customize-setting.php
+++ b/wp-includes/class-wp-customize-setting.php
@@ -131,22 +131,20 @@ class WP_Customize_Setting {
 	 *
 	 * @return bool|null Returns null if preview() has not been called yet.
 	 */
 	public function is_current_blog_previewed() {
 		if ( ! isset( $this->_previewed_blog_id ) ) {
 			return null;
 		}
 		return ( get_current_blog_id() === $this->_previewed_blog_id );
 	}
 
-	protected $_original_value;
-
 	/**
 	 * Original non-previewed value stored by the preview method.
 	 *
 	 * @see WP_Customize_Setting::preview()
 	 * @since 4.1.1
 	 * @var mixed
 	 */
 	protected $_original_value;
 
 	/**