diff --git a/MQTTnet.Core/Client/MqttPacketDispatcher.cs b/MQTTnet.Core/Client/MqttPacketDispatcher.cs
index da8b1fa..aba050d 100644
--- a/MQTTnet.Core/Client/MqttPacketDispatcher.cs
+++ b/MQTTnet.Core/Client/MqttPacketDispatcher.cs
@@ -71,7 +71,7 @@ namespace MQTTnet.Core.Client
 
         private List<MqttPacketAwaiter> GetPacketAwaiters()
         {
-            lock (_packetAwaiters)
+            lock (_syncRoot)
             {
                 return new List<MqttPacketAwaiter>(_packetAwaiters);
             }