diff --git a/osu.Game/Beatmaps/IBeatmapInfo.cs b/osu.Game/Beatmaps/IBeatmapInfo.cs
index 6a3f1b43d8..3d51c5d4b6 100644
--- a/osu.Game/Beatmaps/IBeatmapInfo.cs
+++ b/osu.Game/Beatmaps/IBeatmapInfo.cs
@@ -31,7 +31,7 @@ namespace osu.Game.Beatmaps
         /// <summary>
         /// The beatmap set this beatmap is part of.
         /// </summary>
-        IBeatmapSetInfo BeatmapSet { get; }
+        IBeatmapSetInfo? BeatmapSet { get; }
 
         /// <summary>
         /// The playable length in milliseconds of this beatmap.