diff --git a/osu.Game/Database/LegacyExporter.cs b/osu.Game/Database/LegacyExporter.cs
index c86873ea3f..d1feb5f0cc 100644
--- a/osu.Game/Database/LegacyExporter.cs
+++ b/osu.Game/Database/LegacyExporter.cs
@@ -39,7 +39,7 @@ namespace osu.Game.Database
         /// </summary>
         protected abstract string FileExtension { get; }
 
-        protected Storage UserFileStorage;
+        protected readonly Storage UserFileStorage;
         private readonly Storage exportStorage;
         protected virtual string GetFilename(TModel item) => item.GetDisplayString();