diff --git a/sys/netinet/cc/cc_cubic.h b/sys/netinet/cc/cc_cubic.h
--- a/sys/netinet/cc/cc_cubic.h
+++ b/sys/netinet/cc/cc_cubic.h
@@ -121,8 +121,6 @@
 	uint64_t	undo_W_max;
 	uint64_t	undo_W_est;
 	uint64_t	undo_cwnd_epoch;
-	/* Number of congestion events experienced */
-	uint64_t	num_cong_events;
 	uint32_t css_baseline_minrtt;
 	uint32_t css_current_round_minrtt;
 	uint32_t css_lastround_minrtt;
diff --git a/sys/netinet/cc/cc_cubic.c b/sys/netinet/cc/cc_cubic.c
--- a/sys/netinet/cc/cc_cubic.c
+++ b/sys/netinet/cc/cc_cubic.c
@@ -490,13 +490,11 @@
 		}
 		cubic_data->flags |= CUBICFLAG_CONG_EVENT | CUBICFLAG_RTO_EVENT;
 		cubic_data->undo_W_max = cubic_data->W_max;
-		cubic_data->num_cong_events++;
 		CCV(ccv, snd_cwnd) = mss;
 		break;
 
 	case CC_RTO_ERR:
 		cubic_data->flags &= ~(CUBICFLAG_CONG_EVENT | CUBICFLAG_RTO_EVENT);
-		cubic_data->num_cong_events--;
 		cubic_data->K = cubic_data->undo_K;
 		cubic_data->cwnd_prior = cubic_data->undo_cwnd_prior;
 		cubic_data->W_max = cubic_data->undo_W_max;