diff --git a/src/Serilog.Enrichers.CorrelationId.Tests/Support/DelegateSink.cs b/src/Serilog.Enrichers.CorrelationId.Tests/Support/DelegateSink.cs
index 73e4ddf..14177fc 100644
--- a/src/Serilog.Enrichers.CorrelationId.Tests/Support/DelegateSink.cs
+++ b/src/Serilog.Enrichers.CorrelationId.Tests/Support/DelegateSink.cs
@@ -12,7 +12,8 @@ public class DelegatingSink : ILogEventSink
 
             public DelegatingSink(Action<LogEvent> write)
             {
-                _write = write ?? throw new ArgumentNullException(nameof(write));
+                if (write == null) throw new ArgumentNullException(nameof(write));
+                _write = write;
             }
 
             public void Emit(LogEvent logEvent)
@@ -32,4 +33,4 @@ public static LogEvent GetLogEvent(Action<ILogger> writeAction)
             }
         }
     }
-}
\ No newline at end of file
+}