diff --git a/share/man/man7/tuning.7 b/share/man/man7/tuning.7
index 5720f5f5b886..63e09ecce098 100644
--- a/share/man/man7/tuning.7
+++ b/share/man/man7/tuning.7
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 30, 2017
+.Dd April 16, 2020
 .Dt TUNING 7
 .Os
 .Sh NAME
@@ -435,7 +435,7 @@ number of tiny packets flowing across the network in half.
 The
 .Fx
 delayed ACK implementation also follows the TCP protocol rule that
-at least every other packet be acknowledged even if the standard 100ms
+at least every other packet be acknowledged even if the standard 40ms
 timeout has not yet passed.
 Normally the worst a delayed ACK can do is
 slightly delay the teardown of a connection, or slightly delay the ramp-up
diff --git a/sys/netinet/tcp_timer.h b/sys/netinet/tcp_timer.h
index 01880c52b84c..6f0c3a46605a 100644
--- a/sys/netinet/tcp_timer.h
+++ b/sys/netinet/tcp_timer.h
@@ -119,7 +119,7 @@
 
 #define	TCP_MAXRXTSHIFT	12			/* maximum retransmits */
 
-#define	TCPTV_DELACK	( hz/10 )		/* 100ms timeout */
+#define	TCPTV_DELACK	( hz/25 )		/* 40ms timeout */
 
 /*
  * If we exceed this number of retransmits for a single segment, we'll consider