diff --git a/src/process.tests/DiagnosticListenerTests.cs b/src/process.tests/DiagnosticListenerTests.cs
index fd3ec80..7549a66 100644
--- a/src/process.tests/DiagnosticListenerTests.cs
+++ b/src/process.tests/DiagnosticListenerTests.cs
@@ -122,8 +122,7 @@ internal sealed class DiagnosticListenerTests
 			_name = name;
 		}
 
-		public IReadOnlyList<KeyValuePair<string, Hashtable>> Events => _events.AsReadOnly();
-
+		public IReadOnlyList<KeyValuePair<string, Hashtable>> Events => _events;
 		public Action<string, Hashtable>? ContextChanged { get; set; }
 
 		public void OnNext(DiagnosticListener value)