diff --git a/BTCPayServer.Vault/MainWindow.xaml.cs b/BTCPayServer.Vault/MainWindow.xaml.cs
index f84ea10..836b3f3 100644
--- a/BTCPayServer.Vault/MainWindow.xaml.cs
+++ b/BTCPayServer.Vault/MainWindow.xaml.cs
@@ -54,7 +54,7 @@ namespace BTCPayServer.Vault
             }
         }
 
-        protected override void OnClosing(CancelEventArgs e)
+        protected override void OnClosing(WindowClosingEventArgs e)
         {
             base.OnClosing(e);
             if (Indicator != null)