diff --git a/specification/healthbot/HealthBot.Management/tspconfig.yaml b/specification/healthbot/HealthBot.Management/tspconfig.yaml
index e54f211966c7..120c77a53ffd 100644
--- a/specification/healthbot/HealthBot.Management/tspconfig.yaml
+++ b/specification/healthbot/HealthBot.Management/tspconfig.yaml
@@ -23,6 +23,7 @@ options:
     namespace: "com.azure.resourcemanager.healthbot"
     service-name: "Healthbot" # human-readable service name, whitespace allowed
     flavor: azure
+    use-object-for-unknown: true
   "@azure-tools/typespec-ts":
     service-dir: sdk/healthbot
     emitter-output-dir: "{output-dir}/{service-dir}/arm-healthbot"