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-rw-r--r--src/vnet/tcp/tcp_output.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 2f728cc7333..5a5c7fe4b8b 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -172,7 +172,7 @@ tcp_update_rcv_wnd (tcp_connection_t * tc)
/* Make sure we have a multiple of rcv_wscale */
if (wnd && tc->rcv_wscale)
{
- wnd &= ~(1 << tc->rcv_wscale);
+ wnd &= ~((1 << tc->rcv_wscale) - 1);
if (wnd == 0)
wnd = 1 << tc->rcv_wscale;
}