diff --git a/msg.c b/msg.c
index 9038616..a36d4d0 100644
--- a/msg.c
+++ b/msg.c
@@ -116,7 +116,7 @@ static uint8_t *msg_suffix(struct ptp_message *m)
 	case SYNC:
 		return NULL;
 	case DELAY_REQ:
-		return NULL;
+		return m->delay_req.suffix;
 	case PDELAY_REQ:
 		return NULL;
 	case PDELAY_RESP:
@@ -354,6 +354,7 @@ int msg_post_recv(struct ptp_message *m, int cnt)
 		timestamp_post_recv(m, &m->sync.originTimestamp);
 		break;
 	case DELAY_REQ:
+		suffix = m->delay_req.suffix;
 		break;
 	case PDELAY_REQ:
 		break;
diff --git a/msg.h b/msg.h
index dd8c069..985b78f 100644
--- a/msg.h
+++ b/msg.h
@@ -114,6 +114,7 @@ struct sync_msg {
 struct delay_req_msg {
 	struct ptp_header   hdr;
 	struct Timestamp    originTimestamp;
+	uint8_t             suffix[0];
 } PACKED;
 
 struct follow_up_msg {