diff --git a/ShareX/Forms/MainForm.cs b/ShareX/Forms/MainForm.cs
index 1538a1861..cc08c746d 100644
--- a/ShareX/Forms/MainForm.cs
+++ b/ShareX/Forms/MainForm.cs
@@ -302,7 +302,7 @@ protected override void WndProc(ref Message m)
         {
             if (m.Msg == (int)WindowsMessages.QUERYENDSESSION)
             {
-                EndSessionReasons reason = (EndSessionReasons)(m.LParam.ToInt64() & 0xFFFFFFFF);
+                EndSessionReasons reason = (EndSessionReasons)(long)(m.LParam);
                 if (reason.HasFlag(EndSessionReasons.ENDSESSION_CLOSEAPP))
                 {
                     // Register for restart. This allows our application to automatically restart when it is installing an update from the Store.