diff --git a/src/Alethic.Auth0.Operator/Controllers/V1ResourceServerController.cs b/src/Alethic.Auth0.Operator/Controllers/V1ResourceServerController.cs
index 9f103d0..5e9b5d1 100644
--- a/src/Alethic.Auth0.Operator/Controllers/V1ResourceServerController.cs
+++ b/src/Alethic.Auth0.Operator/Controllers/V1ResourceServerController.cs
@@ -84,7 +84,7 @@ protected override async Task UpdateApi(IManagementApiClient api, string id, Res
         /// <inheritdoc />
         protected override Task ApplyStatus(IManagementApiClient api, V1ResourceServer entity, Hashtable lastConf, CancellationToken cancellationToken)
         {
-            var identifier = ((dynamic)lastConf).identifier;
+            var identifier = (string?)lastConf["identifier"];
             if (string.IsNullOrWhiteSpace(identifier))
                 throw new InvalidOperationException($"{EntityTypeName} {entity.Namespace()}/{entity.Name()} has missing Identifier.");