diff --git a/osu.Game/Database/RealmContextFactory.cs b/osu.Game/Database/RealmContextFactory.cs
index 9e66248d78..b1e97a45d0 100644
--- a/osu.Game/Database/RealmContextFactory.cs
+++ b/osu.Game/Database/RealmContextFactory.cs
@@ -52,7 +52,7 @@ public class RealmContextFactory : IDisposable, IRealmFactory
         /// </summary>
         private readonly SemaphoreSlim contextCreationLock = new SemaphoreSlim(1);
 
-        private ThreadLocal<bool> currentThreadCanCreateContexts = new ThreadLocal<bool>();
+        private readonly ThreadLocal<bool> currentThreadCanCreateContexts = new ThreadLocal<bool>();
 
         private static readonly GlobalStatistic<int> refreshes = GlobalStatistics.Get<int>(@"Realm", @"Dirty Refreshes");
         private static readonly GlobalStatistic<int> contexts_created = GlobalStatistics.Get<int>(@"Realm", @"Contexts (Created)");