diff --git a/lib/formats/msg.cpp b/lib/formats/msg.cpp
index 44acd2dad..b871cbc4e 100644
--- a/lib/formats/msg.cpp
+++ b/lib/formats/msg.cpp
@@ -110,6 +110,8 @@ int msg_from_sample(struct msg *msg_in, struct sample *smp, struct vlist *signal
 {
 	msg_in->type     = MSG_TYPE_DATA;
 	msg_in->version  = MSG_VERSION;
+	msg_in->rsvd1	 = 0;
+	msg_in->resv2    = 0;
 	msg_in->length   = (uint16_t) smp->length;
 	msg_in->sequence = (uint32_t) smp->sequence;
 	msg_in->ts.sec  = smp->ts.origin.tv_sec;