diff --git a/src/mca/oob/tcp/oob_tcp_ping.c b/src/mca/oob/tcp/oob_tcp_ping.c
index 1911efa791..6e433d6ecd 100644
--- a/src/mca/oob/tcp/oob_tcp_ping.c
+++ b/src/mca/oob/tcp/oob_tcp_ping.c
@@ -131,7 +131,8 @@ int mca_oob_tcp_ping(
     }
     hdr.msg_dst = *name;
     hdr.msg_type = MCA_OOB_TCP_PROBE;
- 
+    MCA_OOB_TCP_HDR_HTON(&hdr);
+
     if((rc = write(sd, &hdr, sizeof(hdr))) != sizeof(hdr)) {
         close(sd);
         return OMPI_ERR_UNREACH;