diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c
--- a/sys/netinet/tcp_stacks/rack.c
+++ b/sys/netinet/tcp_stacks/rack.c
@@ -13467,7 +13467,7 @@
 		/* Update the rcv time and perform idle reduction possibly */
 		if  (tp->t_idle_reduce &&
 		     (tp->snd_max == tp->snd_una) &&
-		     ((ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
+		     (TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
 			counter_u64_add(rack_input_idle_reduces, 1);
 			rack_cc_after_idle(rack, tp);
 		}
@@ -14232,7 +14232,7 @@
 	 */
 	if  (tp->t_idle_reduce &&
 	     (tp->snd_max == tp->snd_una) &&
-	     ((ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
+	     (TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur)) {
 		counter_u64_add(rack_input_idle_reduces, 1);
 		rack_cc_after_idle(rack, tp);
 	}
@@ -16783,7 +16783,7 @@
 	 */
 	idle = (tp->t_flags & TF_LASTIDLE) || (tp->snd_max == tp->snd_una);
 	if (tp->t_idle_reduce) {
-		if (idle && ((ticks - tp->t_rcvtime) >= tp->t_rxtcur))
+		if (idle && (TICKS_2_USEC(ticks - tp->t_rcvtime) >= tp->t_rxtcur))
 			rack_cc_after_idle(rack, tp);
 	}
 	tp->t_flags &= ~TF_LASTIDLE;