diff --git a/osu.Game.Tests/Visual/Online/TestSceneCommentActions.cs b/osu.Game.Tests/Visual/Online/TestSceneCommentActions.cs
index af6f8ba97c..bf01d3b0ac 100644
--- a/osu.Game.Tests/Visual/Online/TestSceneCommentActions.cs
+++ b/osu.Game.Tests/Visual/Online/TestSceneCommentActions.cs
@@ -80,7 +80,7 @@ namespace osu.Game.Tests.Visual.Online
             });
         }
 
-        private ManualResetEventSlim deletionPerformed = new ManualResetEventSlim();
+        private readonly ManualResetEventSlim deletionPerformed = new ManualResetEventSlim();
 
         [Test]
         public void TestDeletion()