diff --git a/v2rayN/v2rayUpgrade/MainForm.cs b/v2rayN/v2rayUpgrade/MainForm.cs
index 6a597981..64982a12 100644
--- a/v2rayN/v2rayUpgrade/MainForm.cs
+++ b/v2rayN/v2rayUpgrade/MainForm.cs
@@ -52,6 +52,7 @@ namespace v2rayUpgrade
             var fileName = GetPath(_tempFileName);
             try
             {
+                File.Delete(fileName);
                 File.Copy(_args[0], fileName);
                 if (!File.Exists(fileName))
                 {