diff --git a/osu.Game.Tests/Skins/TestSceneSkinResources.cs b/osu.Game.Tests/Skins/TestSceneSkinResources.cs
index 59a436fdb0..22d6d08355 100644
--- a/osu.Game.Tests/Skins/TestSceneSkinResources.cs
+++ b/osu.Game.Tests/Skins/TestSceneSkinResources.cs
@@ -12,6 +12,7 @@ using osu.Framework.Audio.Sample;
 using osu.Framework.Bindables;
 using osu.Framework.Extensions;
 using osu.Framework.Extensions.ObjectExtensions;
+using osu.Framework.Graphics.Rendering.Dummy;
 using osu.Framework.Graphics.Textures;
 using osu.Framework.IO.Stores;
 using osu.Framework.Testing;
@@ -54,6 +55,7 @@ namespace osu.Game.Tests.Skins
                 lookedUpFileNames = new List<string>();
                 mockResourceProvider = new Mock<IStorageResourceProvider>();
                 mockResourceProvider.Setup(m => m.AudioManager).Returns(Audio);
+                mockResourceProvider.Setup(m => m.Renderer).Returns(new DummyRenderer());
                 mockResourceStore = new Mock<IResourceStore<byte[]>>();
                 mockResourceStore.Setup(r => r.Get(It.IsAny<string>()))
                                  .Callback<string>(n => lookedUpFileNames.Add(n))
diff --git a/osu.Game/IO/IStorageResourceProvider.cs b/osu.Game/IO/IStorageResourceProvider.cs
index ae0dbb963c..08982a8b5f 100644
--- a/osu.Game/IO/IStorageResourceProvider.cs
+++ b/osu.Game/IO/IStorageResourceProvider.cs
@@ -1,8 +1,6 @@
 // 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.
 
-#nullable disable
-
 using osu.Framework.Audio;
 using osu.Framework.Graphics.Rendering;
 using osu.Framework.Graphics.Textures;
@@ -21,7 +19,7 @@ namespace osu.Game.IO
         /// <summary>
         /// Retrieve the game-wide audio manager.
         /// </summary>
-        AudioManager AudioManager { get; }
+        AudioManager? AudioManager { get; }
 
         /// <summary>
         /// Access game-wide user files.