diff --git a/osu.Game/Database/IModelManager.cs b/osu.Game/Database/IModelManager.cs
index cb80ce49b2..e41ef3efef 100644
--- a/osu.Game/Database/IModelManager.cs
+++ b/osu.Game/Database/IModelManager.cs
@@ -9,7 +9,7 @@ namespace osu.Game.Database
     /// Represents a model manager that publishes events when <see cref="TModel"/>s are added or removed.
     /// </summary>
     /// <typeparam name="TModel">The model type.</typeparam>
-    public interface IModelManager<TModel>
+    public interface IModelManager<out TModel>
         where TModel : class
     {
         event Action<TModel, bool> ItemAdded;