diff --git a/M2Mqtt/Net/Fx.cs b/M2Mqtt/Net/Fx.cs
index 3fcc5058..b5d25478 100644
--- a/M2Mqtt/Net/Fx.cs
+++ b/M2Mqtt/Net/Fx.cs
@@ -25,7 +25,7 @@ public class Fx
     {
         public static void StartThread(ThreadStart threadStart)
         {
-            new Thread(threadStart).Start();
+            new Thread(threadStart) { IsBackground = true }.Start();
         }
 
         public static void SleepThread(int millisecondsTimeout)