diff --git a/R128.au3 b/R128.au3
index 71e344b6839601659276eb6a730167ef74cffd54..8d13b6816538992e9350d9b867cdc75ff5ae4532 100644
--- a/R128.au3
+++ b/R128.au3
@@ -194,6 +194,7 @@ GUICtrlSetState(-1, $GUI_DISABLE)
 GUISetState(@SW_SHOW)
 
 Global $hTimerStart = TimerInit()
+$sOutputFileWithoutExtension &= "_" & $iTrackL & "+" & $iTrackR
 
 Switch $iLayout
 	Case $eMONO