diff --git a/Units/MMLCore/windowutil.pas b/Units/MMLCore/windowutil.pas
index 378ed56..4a3e6c0 100644
--- a/Units/MMLCore/windowutil.pas
+++ b/Units/MMLCore/windowutil.pas
@@ -129,7 +129,7 @@ Begin
   RawImage.Data := PByte(Ptr);
 
 End;
-
+{$IFDEF LINUX}
 function MouseWindow: x.TWindow;
 var
    Old_Handler: TXErrorHandler;
@@ -139,6 +139,7 @@ begin
 
   XSetErrorHandler(Old_Handler);
 end;
+{$ENDIF}
 
 end.