diff --git a/websocket-sharp/WebSocketFrame.cs b/websocket-sharp/WebSocketFrame.cs
index d9576126..8f733787 100644
--- a/websocket-sharp/WebSocketFrame.cs
+++ b/websocket-sharp/WebSocketFrame.cs
@@ -379,10 +379,10 @@ namespace WebSocketSharp
         };
 
       var printLine = linePrinter ();
+      var bytes = frame.ToArray ();
 
       output.AppendFormat (headerFmt, String.Empty);
 
-      var bytes = frame.ToArray ();
       for (long i = 0; i <= cnt; i++) {
         var j = i * 4;