diff --git a/src/Microsoft.AspNet.Server.Kestrel/Http/SocketOutput.cs b/src/Microsoft.AspNet.Server.Kestrel/Http/SocketOutput.cs
index 7ff695fc52..c48cb87ed1 100644
--- a/src/Microsoft.AspNet.Server.Kestrel/Http/SocketOutput.cs
+++ b/src/Microsoft.AspNet.Server.Kestrel/Http/SocketOutput.cs
@@ -36,7 +36,7 @@ namespace Microsoft.AspNet.Server.Kestrel.Http
             _callbacksPending = new Queue<CallbackContext>();
         }
 
-        public void Write(ArraySegment<byte> buffer, Action<Exception, object> callback, object state, bool immediate)
+        public void Write(ArraySegment<byte> buffer, Action<Exception, object> callback, object state, bool immediate = true)
         {
             //TODO: need buffering that works
             var copy = new byte[buffer.Count];
diff --git a/test/Microsoft.AspNet.Server.KestrelTests/SocketOutputTests.cs b/test/Microsoft.AspNet.Server.KestrelTests/SocketOutputTests.cs
index bb95a96507..072feecc4f 100644
--- a/test/Microsoft.AspNet.Server.KestrelTests/SocketOutputTests.cs
+++ b/test/Microsoft.AspNet.Server.KestrelTests/SocketOutputTests.cs
@@ -51,7 +51,7 @@ namespace Microsoft.AspNet.Server.KestrelTests
                 };
 
                 // Act
-                socketOutput.Write(buffer, onCompleted, state: null);
+                socketOutput.Write(buffer, onCompleted, null);
 
                 // Assert
                 Assert.True(completedWh.Wait(100));
@@ -94,14 +94,14 @@ namespace Microsoft.AspNet.Server.KestrelTests
                 };
 
                 // Act 
-                socketOutput.Write(buffer, onCompleted, state: null);
+                socketOutput.Write(buffer, onCompleted, null);
                 // Assert
                 // The first write should pre-complete since it is <= _maxBytesPreCompleted.
                 Assert.True(completedWh.Wait(100));
                 // Arrange
                 completedWh.Reset();
                 // Act
-                socketOutput.Write(buffer, onCompleted, state: null);
+                socketOutput.Write(buffer, onCompleted, null);
                 // Assert 
                 // Too many bytes are already pre-completed for the second write to pre-complete.
                 Assert.False(completedWh.Wait(100));