Index: sys/netinet/tcp_stacks/rack.c
===================================================================
--- sys/netinet/tcp_stacks/rack.c
+++ sys/netinet/tcp_stacks/rack.c
@@ -16493,6 +16493,7 @@
 	 */
 	us_cts = tcp_tv_to_usectick(tv);
 	if ((rack->rc_always_pace == 1) &&
+	    (rack->rc_ack_can_sendout_data == 0) &&
 	    (rack->r_ctl.rc_hpts_flags & PACE_PKT_OUTPUT) &&
 	    (TSTMP_LT(us_cts, rack->r_ctl.rc_last_output_to))) {
 		/*