diff --git a/osu.Game/Screens/OsuScreen.cs b/osu.Game/Screens/OsuScreen.cs
index c2da8ea6f3..61018f9e08 100644
--- a/osu.Game/Screens/OsuScreen.cs
+++ b/osu.Game/Screens/OsuScreen.cs
@@ -1,6 +1,7 @@
 // Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using System;
 using Microsoft.EntityFrameworkCore.Internal;
 using osu.Framework.Allocation;
 using osu.Framework.Audio;