diff --git a/src/yamaha2mqtt/app.py b/src/yamaha2mqtt/app.py
index 4cd1e28..9402200 100644
--- a/src/yamaha2mqtt/app.py
+++ b/src/yamaha2mqtt/app.py
@@ -99,12 +99,9 @@ class Yamaha:
             self.request(Zone().set_volume('main', param, ''))
 
         r = self.request(Zone().get_status('main'))
-        msg = {
-            'volume_max': r['max_volume'],
-            'volume': r['volume'],
-        }
 
-        self._client.publish('yamaha/stat/volume', json.dumps(msg))
+        self._client.publish('yamaha/stat/volume', r['volume'])
+        self._client.publish('yamaha/stat/volume', r['max_volume'])
 
     @exception_handler
     def handle_power(self, client, userdata, msg):