diff --git a/websocket-sharp/Net/ChunkStream.cs b/websocket-sharp/Net/ChunkStream.cs
index 4cf9c409..8a95b4d8 100644
--- a/websocket-sharp/Net/ChunkStream.cs
+++ b/websocket-sharp/Net/ChunkStream.cs
@@ -194,8 +194,6 @@ namespace WebSocketSharp.Net
       if (b != 10)
         return InputChunkState.None;
 
-      _chunkRead = 0;
-
       var val = _saved.ToString ();
       var s = removeChunkExtension (val);
 
@@ -206,6 +204,8 @@ namespace WebSocketSharp.Net
         throwProtocolViolation ("The chunk size cannot be parsed.");
       }
 
+      _chunkRead = 0;
+
       if (_chunkSize == 0) {
         _trailerState = 2;