diff --git a/demos/use_cases/preference_based_routing/arch_config.yaml b/demos/use_cases/preference_based_routing/arch_config.yaml
index f0d1cf95..1e5c39e5 100644
--- a/demos/use_cases/preference_based_routing/arch_config.yaml
+++ b/demos/use_cases/preference_based_routing/arch_config.yaml
@@ -13,7 +13,7 @@ listeners:
 llm_providers:
 
   - name: arch-router
-    access_key: $OPENAI_API_KEY
+    access_key: $ARCH_API_KEY
     provider_interface: arch
     model: Arch-Router