diff --git a/statistik_u.pas b/statistik_u.pas
index 802a7a18..25b71cc6 100644
--- a/statistik_u.pas
+++ b/statistik_u.pas
@@ -273,7 +273,7 @@ procedure TstatistikForm.CheckBox2Change(Sender: TObject);
   if CheckBox2.Checked then diagramDrawer.FillStyle:=fsMinOverMax
   else diagramDrawer.FillStyle:=fsNone;
   diagramDrawer.update;
-  PaintBox1.Update;
+  PaintBox1.refresh;
 end;
 
 procedure TstatistikForm.ComboBox1Select(Sender: TObject);