diff --git a/websocket-sharp/Net/ChunkStream.cs b/websocket-sharp/Net/ChunkStream.cs
index a8a9ca11..8ca45eb8 100644
--- a/websocket-sharp/Net/ChunkStream.cs
+++ b/websocket-sharp/Net/ChunkStream.cs
@@ -192,7 +192,7 @@ namespace WebSocketSharp.Net
       }
 
       if (_saved.Length > 20)
-        throwProtocolViolation ("The chunk size is too long.");
+        throwProtocolViolation ("The chunk size is too big.");
 
       if (b != 10)
         return InputChunkState.None;