diff --git a/includes/rest-api/Utilities/SingletonTrait.php b/includes/rest-api/Utilities/SingletonTrait.php
index efeefe6e3d4..b713a6ccbd2 100644
--- a/includes/rest-api/Utilities/SingletonTrait.php
+++ b/includes/rest-api/Utilities/SingletonTrait.php
@@ -45,5 +45,8 @@ trait SingletonTrait {
 	/**
 	 * Prevent unserializing.
 	 */
-	private function __wakeup() {}
+	final public function __wakeup() {
+		wc_doing_it_wrong( __FUNCTION__, __( 'Unserializing instances of this class is forbidden.', 'woocommerce' ), '4.6' );
+		die();
+	}
 }