diff --git a/osu.Game/Screens/Play/KeyCounterDisplay.cs b/osu.Game/Screens/Play/KeyCounterDisplay.cs
index ed47af11a3..0f2f8e43c9 100644
--- a/osu.Game/Screens/Play/KeyCounterDisplay.cs
+++ b/osu.Game/Screens/Play/KeyCounterDisplay.cs
@@ -17,7 +17,7 @@ namespace osu.Game.Screens.Play
     {
         protected readonly Bindable<bool> ConfigVisibility = new Bindable<bool>();
 
-        protected FillFlowContainer<KeyCounter> KeyFlow = new FillFlowContainer<KeyCounter>();
+        protected readonly FillFlowContainer<KeyCounter> KeyFlow = new FillFlowContainer<KeyCounter>();
 
         protected override Container<KeyCounter> Content => KeyFlow;