diff --git a/includes/Core/Authentication/Exception/Google_Proxy_Code_Exception.php b/includes/Core/Authentication/Exception/Google_Proxy_Code_Exception.php
index 7baddcf536a..c41a91d8c63 100644
--- a/includes/Core/Authentication/Exception/Google_Proxy_Code_Exception.php
+++ b/includes/Core/Authentication/Exception/Google_Proxy_Code_Exception.php
@@ -22,6 +22,15 @@
  */
 class Google_Proxy_Code_Exception extends Exception {
 
+	/**
+	 * Temporary code for an undelegated proxy token.
+	 *
+	 * @since n.e.x.t Explicitly declared; previously, it was dynamically declared.
+	 *
+	 * @var string
+	 */
+	protected $access_code;
+
 	/**
 	 * Constructor.
 	 *
diff --git a/includes/Core/Authentication/Setup.php b/includes/Core/Authentication/Setup.php
index bcf93f271fd..4e00539c342 100644
--- a/includes/Core/Authentication/Setup.php
+++ b/includes/Core/Authentication/Setup.php
@@ -63,6 +63,15 @@ class Setup {
 	 */
 	protected $google_proxy;
 
+	/**
+	 * Proxy support URL.
+	 *
+	 * @since n.e.x.t Explicitly declared; previously, it was dynamically declared.
+	 *
+	 * @var string
+	 */
+	protected $proxy_support_link_url;
+
 	/**
 	 * Credentials instance.
 	 *
diff --git a/includes/Core/Modules/Tags/Module_Tag.php b/includes/Core/Modules/Tags/Module_Tag.php
index 3fb641da01b..acd5d51ec3f 100644
--- a/includes/Core/Modules/Tags/Module_Tag.php
+++ b/includes/Core/Modules/Tags/Module_Tag.php
@@ -25,9 +25,11 @@ abstract class Module_Tag extends Tag {
 	 * Module slug.
 	 *
 	 * @since 1.24.0
+	 * @since n.e.x.t Renamed from slug to module_slug.
+	 *
 	 * @var string
 	 */
-	protected $slug;
+	protected $module_slug;
 
 	/**
 	 * Constructor.