diff --git a/websocket-sharp/Net/ChunkedRequestStream.cs b/websocket-sharp/Net/ChunkedRequestStream.cs
index c266f37f..661a3564 100644
--- a/websocket-sharp/Net/ChunkedRequestStream.cs
+++ b/websocket-sharp/Net/ChunkedRequestStream.cs
@@ -46,7 +46,7 @@ namespace WebSocketSharp.Net
   {
     #region Private Fields
 
-    private const int           _bufferLength = 8192;
+    private static readonly int _bufferLength;
     private HttpListenerContext _context;
     private ChunkStream         _decoder;
     private bool                _disposed;
@@ -54,6 +54,15 @@ namespace WebSocketSharp.Net
 
     #endregion
 
+    #region Static Constructor
+
+    static ChunkedRequestStream ()
+    {
+      _bufferLength = 8192;
+    }
+
+    #endregion
+
     #region Internal Constructors
 
     internal ChunkedRequestStream (