diff --git a/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs b/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
index 7810cc3..1428d69 100644
--- a/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
+++ b/WelsonJS.Toolkit/WelsonJS.Launcher/Program.cs
@@ -29,8 +29,8 @@ namespace WelsonJS.Launcher
         static void Main()
         {
             // create the mutex
-            _mutex = new Mutex(true, "WelsonJS.Launcher", out bool mutexNotExists);
-            if (!mutexNotExists)
+            _mutex = new Mutex(true, "WelsonJS.Launcher", out bool _createdNew);
+            if (!_createdNew)
             {
                 _logger.Error("WelsonJS Launcher already running.");
                 return;