diff --git a/src/Entity/UserSystem/Group.php b/src/Entity/UserSystem/Group.php
index 9f60d03f..94bdb8e1 100644
--- a/src/Entity/UserSystem/Group.php
+++ b/src/Entity/UserSystem/Group.php
@@ -78,8 +78,9 @@ class Group extends AbstractStructuralDBElement implements HasPermissionsInterfa
 
     /**
      * @ORM\OneToMany(targetEntity="User", mappedBy="group")
+     * @var Collection<User>
      */
-    protected Collection $users;
+    protected $users;
 
     /**
      * @var bool If true all users associated with this group must have enabled some kind of 2 factor authentication