diff --git a/ZmqttDiscovery.ino b/ZmqttDiscovery.ino
index 183eb3d..1ca91ea 100644
--- a/ZmqttDiscovery.ino
+++ b/ZmqttDiscovery.ino
@@ -384,7 +384,7 @@ void createDiscovery(char * sensor_type,
 
 
   if (child_device){
-    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(5) + JSON_ARRAY_SIZE(1);
+    const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(5) + JSON_ARRAY_SIZE(2);
     StaticJsonBuffer<JSON_MSG_CALC_BUFFER> jsonDeviceBuffer;
     JsonObject &device = jsonDeviceBuffer.createObject();
     device.set("name", Gateway_Name);