diff --git a/application/Espo/Core/ApplicationUser.php b/application/Espo/Core/ApplicationUser.php
index 791bcc8114..fbca11aa28 100644
--- a/application/Espo/Core/ApplicationUser.php
+++ b/application/Espo/Core/ApplicationUser.php
@@ -46,8 +46,9 @@ use Espo\Core\{
  */
 class ApplicationUser
 {
-    protected $container;
-    protected $entityManagerProxy;
+    private $container;
+
+    private $entityManagerProxy;
 
     public function __construct(Container $container, EntityManagerProxy $entityManagerProxy)
     {
@@ -58,7 +59,7 @@ class ApplicationUser
     /**
      * Setup the system user as a current user. The system user is used when no user is logged in.
      */
-    public function setupSystemUser()
+    public function setupSystemUser() : void
     {
         $user = $this->entityManagerProxy->getEntity('User', 'system');
 
@@ -75,7 +76,7 @@ class ApplicationUser
     /**
      * Set a current user.
      */
-    public function setUser(User $user)
+    public function setUser(User $user) : void
     {
         $this->container->set('user', $user);
     }