diff --git a/Source/MQTTnet/MqttApplicationMessage.cs b/Source/MQTTnet/MqttApplicationMessage.cs
index 688bb65b..65200740 100644
--- a/Source/MQTTnet/MqttApplicationMessage.cs
+++ b/Source/MQTTnet/MqttApplicationMessage.cs
@@ -30,6 +30,6 @@ namespace MQTTnet
 
         public List<uint> SubscriptionIdentifiers { get; set; }
 
-        public uint DeliveryCount { get; set; }
+        internal uint DeliveryCount { get; set; }
     }
 }