diff --git a/osu.Game.Tests/Visual/TestCasePlayerLoader.cs b/osu.Game.Tests/Visual/TestCasePlayerLoader.cs
index 3e3f9eb9f3..156393670d 100644
--- a/osu.Game.Tests/Visual/TestCasePlayerLoader.cs
+++ b/osu.Game.Tests/Visual/TestCasePlayerLoader.cs
@@ -14,7 +14,7 @@ namespace osu.Game.Tests.Visual
     public class TestCasePlayerLoader : ManualInputManagerTestCase
     {
         private PlayerLoader loader;
-        private ScreenStack stack;
+        private readonly ScreenStack stack;
 
         [Cached]
         private BackgroundScreenStack backgroundStack;