diff --git a/src/IO.Ably.Tests.Shared/Helpers/DefaultLogger.cs b/src/IO.Ably.Tests.Shared/Helpers/DefaultLogger.cs
index 5edf2c6c0..dd68deda8 100644
--- a/src/IO.Ably.Tests.Shared/Helpers/DefaultLogger.cs
+++ b/src/IO.Ably.Tests.Shared/Helpers/DefaultLogger.cs
@@ -5,7 +5,26 @@ namespace IO.Ably.Tests.Shared.Helpers
     /// <summary>An utility class for logging various messages.</summary>
     public static class DefaultLogger
     {
-        internal static ILogger LoggerInstance => InternalLogger.Create();
+        private static readonly object SyncLock = new object();
+        private static ILogger _loggerInstance;
+
+        internal static ILogger LoggerInstance
+        {
+            get
+            {
+                if (_loggerInstance == null)
+                {
+                    lock (SyncLock)
+                    {
+                        _loggerInstance = InternalLogger.Create();
+                    }
+                }
+
+                return _loggerInstance;
+            }
+
+            set => _loggerInstance = value;
+        }
 
         /// <summary>Maximum level to log.</summary>
         /// <remarks>E.g. set to LogLevel.Warning to have only errors and warnings in the log.</remarks>
diff --git a/src/IO.Ably.Tests.Shared/Realtime/DeltaSandboxSpecs.cs b/src/IO.Ably.Tests.Shared/Realtime/DeltaSandboxSpecs.cs
index b3d13cb70..e18abb32b 100644
--- a/src/IO.Ably.Tests.Shared/Realtime/DeltaSandboxSpecs.cs
+++ b/src/IO.Ably.Tests.Shared/Realtime/DeltaSandboxSpecs.cs
@@ -231,7 +231,7 @@ public async Task WhenDeltaDecodeFail_ShouldSetStateToAttachingLogTheErrorAndDis
             var firstMessageReceived = new TaskCompletionAwaiter();
             using (((IInternalLogger)Logger).CreateDisposableLoggingContext(testSink))
             {
-                var realtime = await GetRealtimeClient(protocol);
+                var realtime = await GetRealtimeClient(protocol, (options, _) => options.LogHandler = testSink);
                 var channel = realtime.Channels.Get(channelName, new ChannelOptions(channelParams: new ChannelParams { { "delta", "vcdiff" } }));
 
                 var received = new List<Message>();