diff --git a/websocket-sharp/Net/ChunkedRequestStream.cs b/websocket-sharp/Net/ChunkedRequestStream.cs
index 713d7dd6..dfb91923 100644
--- a/websocket-sharp/Net/ChunkedRequestStream.cs
+++ b/websocket-sharp/Net/ChunkedRequestStream.cs
@@ -63,7 +63,7 @@ namespace WebSocketSharp.Net
       int count,
       HttpListenerContext context
     )
-      : base (stream, buffer, offset, count)
+      : base (stream, buffer, offset, count, -1)
     {
       _context = context;