diff --git a/test/configuration.yaml b/test/configuration.yaml
index 3e39f09..791af6b 100644
--- a/test/configuration.yaml
+++ b/test/configuration.yaml
@@ -16,3 +16,7 @@ demo:
 sensor:
   - platform: otp
     token: !secret frenck
+
+homeassistant:
+  allowlist_external_dirs:
+    - "/config"