diff --git a/pbs-api-types/src/userid.rs b/pbs-api-types/src/userid.rs
index e931181e..8418f13e 100644
--- a/pbs-api-types/src/userid.rs
+++ b/pbs-api-types/src/userid.rs
@@ -30,7 +30,7 @@ use lazy_static::lazy_static;
 use serde::{Deserialize, Serialize};
 
 use proxmox::api::api;
-use proxmox::api::schema::{ApiStringFormat, Schema, StringSchema};
+use proxmox::api::schema::{ApiStringFormat, Schema, StringSchema, Updatable};
 use proxmox::const_regex;
 
 // we only allow a limited set of characters
@@ -403,6 +403,12 @@ pub struct Userid {
     name_len: usize,
 }
 
+impl Updatable for Userid {
+    type Updater = Option<Userid>;
+
+    const UPDATER_IS_OPTION: bool = true;
+}
+
 impl Userid {
     pub const API_SCHEMA: Schema = StringSchema::new("User ID")
         .format(&PROXMOX_USER_ID_FORMAT)