diff --git a/hc2mqtt.py b/hc2mqtt.py
index fdf08aa..6186b11 100755
--- a/hc2mqtt.py
+++ b/hc2mqtt.py
@@ -200,4 +200,4 @@ def client_connect(client, device, mqtt_topic):
 
 
 if __name__ == "__main__":
-    hc2mqtt()
+    hc2mqtt(auto_envvar_prefix="HCPY")