diff --git a/NetworkPkg/Mtftp6Dxe/Mtftp6Rrq.c b/NetworkPkg/Mtftp6Dxe/Mtftp6Rrq.c
index 4a481f4b46..121b2a3726 100644
--- a/NetworkPkg/Mtftp6Dxe/Mtftp6Rrq.c
+++ b/NetworkPkg/Mtftp6Dxe/Mtftp6Rrq.c
@@ -59,6 +59,7 @@ Mtftp6RrqSendAck (
   // Reset current retry count of the instance.
   //
   Instance->CurRetry = 0;
+  Instance->LastPacket = Packet;
 
   return Mtftp6TransmitPacket (Instance, Packet);
 }