diff --git a/sys/netinet/tcp.h b/sys/netinet/tcp.h
index a312078683da..64aa6e8c66f4 100644
--- a/sys/netinet/tcp.h
+++ b/sys/netinet/tcp.h
@@ -216,7 +216,7 @@ struct tcp_info {
 	u_int32_t	__tcpi_reordering;
 
 	u_int32_t	__tcpi_rcv_rtt;
-	u_int32_t	__tcpi_rcv_space;
+	u_int32_t	tcpi_rcv_space;		/* Advertised recv window. */
 
 	/* FreeBSD extensions to tcp_info. */
 	u_int32_t	tcpi_snd_wnd;		/* Advertised send window. */
diff --git a/sys/netinet/tcp_usrreq.c b/sys/netinet/tcp_usrreq.c
index b07458b5e580..66bd7955fda0 100644
--- a/sys/netinet/tcp_usrreq.c
+++ b/sys/netinet/tcp_usrreq.c
@@ -974,6 +974,7 @@ tcp_fill_info(tp, ti)
 	/*
 	 * FreeBSD-specific extension fields for tcp_info.
 	 */
+	ti->tcpi_rcv_space = tp->rcv_wnd;
 	ti->tcpi_snd_wnd = tp->snd_wnd;
 	ti->tcpi_snd_bwnd = tp->snd_bwnd;
 }