--- dd873f3119b2	
+++ dd873f3119b2	
@@ -2100,7 +2100,7 @@ 
 uint16_t
 TcpSocketBase::AdvertisedWindowSize ()
 {
-  uint32_t w = m_rxBuffer->MaxBufferSize () - m_rxBuffer->Size ();
+  uint32_t w = m_rxBuffer->MaxBufferSize ();
 
   w >>= m_sndScaleFactor;