diff --git a/osu.Game/Overlays/NotificationOverlay.cs b/osu.Game/Overlays/NotificationOverlay.cs
index f1e39b947d..21027b0931 100644
--- a/osu.Game/Overlays/NotificationOverlay.cs
+++ b/osu.Game/Overlays/NotificationOverlay.cs
@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using osu.Framework.Allocation;