diff --git a/osu.Game/Beatmaps/WorkingBeatmap.cs b/osu.Game/Beatmaps/WorkingBeatmap.cs
index a94511ca2e..417e289b65 100644
--- a/osu.Game/Beatmaps/WorkingBeatmap.cs
+++ b/osu.Game/Beatmaps/WorkingBeatmap.cs
@@ -43,7 +43,7 @@ namespace osu.Game.Beatmaps
         }
 
         private Beatmap beatmap;
-        private object beatmapLock;
+        private object beatmapLock = new object();
         public Beatmap Beatmap
         {
             get