diff --git a/services/acl/Acl.Infrastructure/OpenZaakGateway.cs b/services/acl/Acl.Infrastructure/OpenZaakGateway.cs
index cee0c9a..fca6cb2 100644
--- a/services/acl/Acl.Infrastructure/OpenZaakGateway.cs
+++ b/services/acl/Acl.Infrastructure/OpenZaakGateway.cs
@@ -99,7 +99,10 @@ public sealed class OpenZaakGateway(HttpClient http, OpenZaakOptions options) :
                 request.Inhoud.Length,
                 request.Vertrouwelijkheidaanduiding,
                 request.Formaat,
-                "definitief"),
+                "definitief",
+                // No usage-rights restrictions apply. Left null, OpenZaak rejects closing the related
+                // zaak with "indicatiegebruiksrecht-unset"; false records the deliberate "none" answer.
+                false),
             "Creating the informatieobject", ct);
 
         // 2. Relate it to the zaak (Zaken API — no CRS).
@@ -248,7 +251,8 @@ public sealed class OpenZaakGateway(HttpClient http, OpenZaakOptions options) :
         [property: JsonPropertyName("bestandsomvang")] int Bestandsomvang,
         [property: JsonPropertyName("vertrouwelijkheidaanduiding")] string Vertrouwelijkheidaanduiding,
         [property: JsonPropertyName("formaat")] string Formaat,
-        [property: JsonPropertyName("status")] string Status);
+        [property: JsonPropertyName("status")] string Status,
+        [property: JsonPropertyName("indicatiegebruiksrecht")] bool Indicatiegebruiksrecht);
 
     private sealed record ZaakInformatieobjectDto(
         [property: JsonPropertyName("zaak")] string Zaak,