diff --git a/src/mca/ptl/mx/ptl_mx.c b/src/mca/ptl/mx/ptl_mx.c
index 8721a40949..38d2344eca 100644
--- a/src/mca/ptl/mx/ptl_mx.c
+++ b/src/mca/ptl/mx/ptl_mx.c
@@ -240,7 +240,7 @@ int mca_ptl_mx_send(
         sendfrag->frag_segments,
         sendfrag->frag_segment_count,
         ptl_peer->peer_addr,
-        1,
+        0,
         sendfrag,
         &sendfrag->frag_request);
     if(mx_return != MX_SUCCESS) {