diff --git a/sys/netinet/sctp_output.c b/sys/netinet/sctp_output.c
index cca4be4e147a..d8c3caef6ff4 100644
--- a/sys/netinet/sctp_output.c
+++ b/sys/netinet/sctp_output.c
@@ -7325,10 +7325,12 @@ re_look:
 			/* All of it fits in the MTU */
 			if (sp->some_taken) {
 				rcv_flags |= SCTP_DATA_LAST_FRAG;
-				sp->put_last_out = 1;
 			} else {
 				rcv_flags |= SCTP_DATA_NOT_FRAG;
-				sp->put_last_out = 1;
+			}
+			sp->put_last_out = 1;
+			if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
+				rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 			}
 		} else {
 			/* Not all of it fits, we fragment */
@@ -7396,8 +7398,8 @@ re_look:
 	if (sp->sinfo_flags & SCTP_UNORDERED) {
 		rcv_flags |= SCTP_DATA_UNORDERED;
 	}
-	if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
-	    ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
+	if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
+	    (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
 		rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 	}
 	/* clear out the chunk before setting up */
@@ -13280,7 +13282,9 @@ skip_preblock:
 				sctp_snd_sb_alloc(stcb, sndout);
 				atomic_add_int(&sp->length, sndout);
 				len += sndout;
-
+				if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
+					sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
+				}
 				/* Did we reach EOR? */
 				if ((uio->uio_resid == 0) &&
 				    ((user_marks_eor == 0) ||