diff --git a/Symcon_Publish_to_Shelly_MQTT/module.php b/Symcon_Publish_to_Shelly_MQTT/module.php
index bded71f..6325a90 100644
--- a/Symcon_Publish_to_Shelly_MQTT/module.php
+++ b/Symcon_Publish_to_Shelly_MQTT/module.php
@@ -17,7 +17,7 @@ class Symcon_Publish_to_Shelly_MQTT extends IPSModule
         $this->RegisterPropertyInteger("msg_id", 1);
         $this->RegisterPropertyString("src", "user1");
         $this->RegisterPropertyString("method", "Switch.Set");
-        $this->RegisterPropertyBoolean("switch_bool", "");
+        $this->RegisterPropertyBoolean("switch_bool", "true");
 
 
     }