diff --git a/websocket-sharp/WebSocketFrame.cs b/websocket-sharp/WebSocketFrame.cs
index 29f6dd8b..d080ac81 100644
--- a/websocket-sharp/WebSocketFrame.cs
+++ b/websocket-sharp/WebSocketFrame.cs
@@ -883,8 +883,11 @@ Extended Payload Length: {7}
           ((ushort) header).InternalToByteArray (ByteOrder.Big), 0, 2
         );
 
-        if (_payloadLength > 125)
-          buff.Write (_extPayloadLength, 0, _payloadLength == 126 ? 2 : 8);
+        if (_payloadLength > 125) {
+          var cnt = _payloadLength == 126 ? 2 : 8;
+
+          buff.Write (_extPayloadLength, 0, cnt);
+        }
 
         if (_mask == Mask.On)
           buff.Write (_maskingKey, 0, 4);