diff --git a/app/Models/User.php b/app/Models/User.php
index 1dc59b1ba9..20535c7437 100755
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -70,6 +70,7 @@ class User extends SnipeModel implements AuthenticatableContract, AuthorizableCo
         'email'                   => 'email|nullable',
         'password'                => 'required|min:6',
         'locale'                  => 'max:10|nullable',
+        'manager_id'              => 'exists:users,id|nullable'
     ];
 
     use Searchable;