diff --git a/MdeModulePkg/Universal/Network/Tcp4Dxe/Tcp4Input.c b/MdeModulePkg/Universal/Network/Tcp4Dxe/Tcp4Input.c
index 11936ad7f1..b7f329be7a 100644
--- a/MdeModulePkg/Universal/Network/Tcp4Dxe/Tcp4Input.c
+++ b/MdeModulePkg/Universal/Network/Tcp4Dxe/Tcp4Input.c
@@ -32,7 +32,7 @@ TcpSeqAcceptable (
   IN TCP_SEG *Seg
   )
 {
-  return (TCP_SEQ_LEQ (Tcb->RcvWl2, Seg->End) &&
+  return (TCP_SEQ_LEQ (Tcb->RcvNxt, Seg->End) &&
           TCP_SEQ_LT (Seg->Seq, Tcb->RcvWl2 + Tcb->RcvWnd));
 }