diff --git a/sys/netinet/sctp_header.h b/sys/netinet/sctp_header.h
index d38c8375fb32..850290d52f52 100644
--- a/sys/netinet/sctp_header.h
+++ b/sys/netinet/sctp_header.h
@@ -160,7 +160,7 @@ struct sctp_idata {
 	union {
 		uint32_t protocol_id;
 		uint32_t fsn;	/* Fragment Sequence Number */
-	};
+	}     ppid_fsn;
 	/* user data follows */
 }          SCTP_PACKED;
 
diff --git a/sys/netinet/sctp_indata.c b/sys/netinet/sctp_indata.c
index 76f0ad33df78..6415fb2a8d07 100644
--- a/sys/netinet/sctp_indata.c
+++ b/sys/netinet/sctp_indata.c
@@ -1558,7 +1558,7 @@ sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
 		if (ch->ch.chunk_flags & SCTP_DATA_FIRST_FRAG)
 			fsn = 0;
 		else
-			fsn = ntohl(nch->dp.fsn);
+			fsn = ntohl(nch->dp.ppid_fsn.fsn);
 		old_data = 0;
 	} else {
 		ch = (struct sctp_data_chunk *)sctp_m_getptr(*m, offset,
diff --git a/sys/netinet/sctp_output.c b/sys/netinet/sctp_output.c
index 4e683a21ffcb..ef789eabddd0 100644
--- a/sys/netinet/sctp_output.c
+++ b/sys/netinet/sctp_output.c
@@ -7641,9 +7641,9 @@ sctp_move_to_outqueue(struct sctp_tcb *stcb,
 		ndchkh->dp.reserved = htons(0);
 		ndchkh->dp.msg_id = htonl(sp->msg_id);
 		if (sp->fsn == 0)
-			ndchkh->dp.protocol_id = chk->rec.data.payloadtype;
+			ndchkh->dp.ppid_fsn.protocol_id = chk->rec.data.payloadtype;
 		else
-			ndchkh->dp.fsn = htonl(sp->fsn);
+			ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
 		sp->fsn++;
 		ndchkh->ch.chunk_length = htons(chk->send_size);
 	}