diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4
--- a/share/man/man4/tcp.4
+++ b/share/man/man4/tcp.4
@@ -31,7 +31,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd November 17, 2023
+.Dd November 30, 2023
 .Dt TCP 4
 .Os
 .Sh NAME
@@ -465,7 +465,7 @@
 .It Va delayed_ack
 Delay ACK to try and piggyback it onto a data packet or another ACK.
 .It Va do_lrd
-Enable Lost Retransmission Detection for SACK-enabled sessions, disabled by
+Enable Lost Retransmission Detection for SACK-enabled sessions, enabled by
 default.
 Under severe congestion, a retransmission can be lost which then leads to a
 mandatory Retransmission Timeout (RTO), followed by slow-start.
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -162,7 +162,7 @@
     &VNET_NAME(tcp_do_prr), 1,
     "Enable Proportional Rate Reduction per RFC 6937");
 
-VNET_DEFINE(int, tcp_do_lrd) = 0;
+VNET_DEFINE(int, tcp_do_lrd) = 1;
 SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_lrd, CTLFLAG_VNET | CTLFLAG_RW,
     &VNET_NAME(tcp_do_lrd), 1,
     "Perform Lost Retransmission Detection");