diff --git a/ompi/mca/pml/base/pml_base_bsend.c b/ompi/mca/pml/base/pml_base_bsend.c
index 5ca9395abe..4ddbb66a5d 100644
--- a/ompi/mca/pml/base/pml_base_bsend.c
+++ b/ompi/mca/pml/base/pml_base_bsend.c
@@ -223,6 +223,13 @@ int mca_pml_base_bsend_request_start(ompi_request_t* request)
         sendreq->req_count = sendreq->req_bytes_packed;
         sendreq->req_datatype = MPI_BYTE;
 
+        /* In case we reuse an old request recreate the correct convertor, the one
+         * using the user buffers. Otherwise at the end of this function we replace
+         * it with a convertor using the allocator buffer !!!
+         */
+        ompi_convertor_prepare_for_send( &sendreq->req_convertor, sendreq->req_datatype,
+                                         sendreq->req_count, sendreq->req_base.req_addr );
+
         /* increment count of pending requests */
         mca_pml_bsend_count++;
         OPAL_THREAD_UNLOCK(&mca_pml_bsend_mutex);