diff --git a/sys/netinet/sctp_indata.c b/sys/netinet/sctp_indata.c
index 558238c044cc..77017802fb77 100644
--- a/sys/netinet/sctp_indata.c
+++ b/sys/netinet/sctp_indata.c
@@ -3963,7 +3963,15 @@ sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
 					tp1->whoTo->cwnd -= tp1->book_size;
 					tp1->rec.data.chunk_was_revoked = 0;
 				}
-				tp1->sent = SCTP_DATAGRAM_ACKED;
+				if (tp1->sent != SCTP_DATAGRAM_NR_MARKED) {
+					if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
+						asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+					} else {
+						panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
+#endif
+					}
+				}
 				TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
 				if (tp1->data) {
 					/* sa_ignore NO_NULL_CHK */
@@ -4699,10 +4707,14 @@ sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup,
 		if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) {
 			break;
 		}
-		if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
-			/* no more sent on list */
-			SCTP_PRINTF("Warning, tp1->sent == %d and its now acked?\n",
-			    tp1->sent);
+		if (tp1->sent != SCTP_DATAGRAM_NR_MARKED) {
+			if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
+				asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+			} else {
+				panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
+#endif
+			}
 		}
 		TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
 		if (tp1->pr_sctp_on) {
diff --git a/sys/netinet/sctp_input.c b/sys/netinet/sctp_input.c
index 2371ecb4ef8e..d1a0ef6ee2ea 100644
--- a/sys/netinet/sctp_input.c
+++ b/sys/netinet/sctp_input.c
@@ -311,6 +311,13 @@ sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
 			if (chk->rec.data.stream_number >= newcnt) {
 				TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 				asoc->send_queue_cnt--;
+				if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
+					asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+				} else {
+					panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
+#endif
+				}
 				if (chk->data != NULL) {
 					sctp_free_bufspace(stcb, asoc, chk, 1);
 					sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
diff --git a/sys/netinet/sctp_pcb.c b/sys/netinet/sctp_pcb.c
index 4a40b9176819..93115f879cc1 100644
--- a/sys/netinet/sctp_pcb.c
+++ b/sys/netinet/sctp_pcb.c
@@ -4949,6 +4949,15 @@ sctp_free_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int from_inpcbfre
 	}
 	/* sent queue SHOULD be empty */
 	TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
+		if (chk->sent != SCTP_DATAGRAM_NR_MARKED) {
+			if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
+				asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+			} else {
+				panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
+#endif
+			}
+		}
 		TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 		if (chk->data) {
 			if (so) {
diff --git a/sys/netinet/sctp_structs.h b/sys/netinet/sctp_structs.h
index d899ee5d5fc2..05d5fd1e065d 100644
--- a/sys/netinet/sctp_structs.h
+++ b/sys/netinet/sctp_structs.h
@@ -588,6 +588,7 @@ union scheduling_parameters {
 struct sctp_stream_out {
 	struct sctp_streamhead outqueue;
 	union scheduling_parameters ss_params;
+	uint32_t chunks_on_queues;
 	uint16_t stream_no;
 	uint16_t next_sequence_send;	/* next one I expect to send out */
 	uint8_t last_msg_incomplete;
diff --git a/sys/netinet/sctp_timer.c b/sys/netinet/sctp_timer.c
index d4223506b1d1..fe7f754c5b86 100644
--- a/sys/netinet/sctp_timer.c
+++ b/sys/netinet/sctp_timer.c
@@ -440,6 +440,11 @@ sctp_recover_sent_list(struct sctp_tcb *stcb)
 		if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
 			SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
 			    (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
+			if (chk->sent != SCTP_DATAGRAM_NR_MARKED) {
+				if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
+					asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
+				}
+			}
 			TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 			if (chk->pr_sctp_on) {
 				if (asoc->pr_sctp_cnt != 0)
diff --git a/sys/netinet/sctputil.c b/sys/netinet/sctputil.c
index d636c2848a73..72dc34ebdba7 100644
--- a/sys/netinet/sctputil.c
+++ b/sys/netinet/sctputil.c
@@ -3727,6 +3727,15 @@ sctp_report_all_outbound(struct sctp_tcb *stcb, uint16_t error, int holds_lock,
 	TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
 		TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
 		asoc->sent_queue_cnt--;
+		if (chk->sent != SCTP_DATAGRAM_NR_MARKED) {
+			if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
+				asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+			} else {
+				panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
+#endif
+			}
+		}
 		if (chk->data != NULL) {
 			sctp_free_bufspace(stcb, asoc, chk, 1);
 			sctp_ulp_notify(SCTP_NOTIFY_SENT_DG_FAIL, stcb,
@@ -3743,6 +3752,13 @@ sctp_report_all_outbound(struct sctp_tcb *stcb, uint16_t error, int holds_lock,
 	TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 		TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
 		asoc->send_queue_cnt--;
+		if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
+			asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+		} else {
+			panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number);
+#endif
+		}
 		if (chk->data != NULL) {
 			sctp_free_bufspace(stcb, asoc, chk, 1);
 			sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,