diff --git a/osu.Game.Tests/Rulesets/TestSceneDrawableRulesetDependencies.cs b/osu.Game.Tests/Rulesets/TestSceneDrawableRulesetDependencies.cs
index 3fba21050e..5cfcca303f 100644
--- a/osu.Game.Tests/Rulesets/TestSceneDrawableRulesetDependencies.cs
+++ b/osu.Game.Tests/Rulesets/TestSceneDrawableRulesetDependencies.cs
@@ -150,6 +150,8 @@ namespace osu.Game.Tests.Rulesets
             public IBindable<double> AggregateTempo => throw new NotImplementedException();
 
             public int PlaybackConcurrency { get; set; }
+
+            public void AddExtension(string extension) => throw new NotImplementedException();
         }
 
         private class TestShaderManager : ShaderManager
diff --git a/osu.Game/Rulesets/UI/DrawableRulesetDependencies.cs b/osu.Game/Rulesets/UI/DrawableRulesetDependencies.cs
index c50f63c3b2..96b02ee4dc 100644
--- a/osu.Game/Rulesets/UI/DrawableRulesetDependencies.cs
+++ b/osu.Game/Rulesets/UI/DrawableRulesetDependencies.cs
@@ -157,6 +157,8 @@ namespace osu.Game.Rulesets.UI
                 set => throw new NotSupportedException();
             }
 
+            public void AddExtension(string extension) => throw new NotSupportedException();
+
             public void Dispose()
             {
                 if (primary.IsNotNull()) primary.Dispose();
diff --git a/osu.Game/Skinning/Skin.cs b/osu.Game/Skinning/Skin.cs
index 419dacadfd..37e98946c9 100644
--- a/osu.Game/Skinning/Skin.cs
+++ b/osu.Game/Skinning/Skin.cs
@@ -69,12 +69,15 @@ namespace osu.Game.Skinning
                 storage ??= realmBackedStorage = new RealmBackedResourceStore<SkinInfo>(SkinInfo, resources.Files, resources.RealmAccess);
 
                 var samples = resources.AudioManager?.GetSampleStore(storage);
+
                 if (samples != null)
+                {
                     samples.PlaybackConcurrency = OsuGameBase.SAMPLE_CONCURRENCY;
 
-                // osu-stable performs audio lookups in order of wav -> mp3 -> ogg.
-                // The GetSampleStore() call above internally adds wav and mp3, so ogg is added at the end to ensure expected ordering.
-                (storage as ResourceStore<byte[]>)?.AddExtension("ogg");
+                    // osu-stable performs audio lookups in order of wav -> mp3 -> ogg.
+                    // The GetSampleStore() call above internally adds wav and mp3, so ogg is added at the end to ensure expected ordering.
+                    samples.AddExtension(@"ogg");
+                }
 
                 Samples = samples;
                 Textures = new TextureStore(resources.Renderer, new MaxDimensionLimitedTextureLoaderStore(resources.CreateTextureLoaderStore(storage)));