diff --git a/pbs-api-types/src/lib.rs b/pbs-api-types/src/lib.rs
index 14c8cd35..aa0dd9a1 100644
--- a/pbs-api-types/src/lib.rs
+++ b/pbs-api-types/src/lib.rs
@@ -152,6 +152,12 @@ pub const DATASTORE_SCHEMA: Schema = StringSchema::new("Datastore name.")
     .max_length(32)
     .schema();
 
+pub const REALM_ID_SCHEMA: Schema = StringSchema::new("Realm name.")
+    .format(&PROXMOX_SAFE_ID_FORMAT)
+    .min_length(2)
+    .max_length(32)
+    .schema();
+
 pub const FINGERPRINT_SHA256_FORMAT: ApiStringFormat =
     ApiStringFormat::Pattern(&FINGERPRINT_SHA256_REGEX);