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diff --git a/opal/mca/btl/vader/btl_vader_fbox.h b/opal/mca/btl/vader/btl_vader_fbox.h
index 17239ce8ef..ee5c913551 100644
--- a/opal/mca/btl/vader/btl_vader_fbox.h
+++ b/opal/mca/btl/vader/btl_vader_fbox.h
@@ -138,9 +138,6 @@ static inline bool mca_btl_vader_fbox_sendi (mca_btl_base_endpoint_t *ep, unsign
memcpy (data + header_size, payload, payload_size);
}
- /* write out part of the header now. the tag will be written when the data is available */
- mca_btl_vader_fbox_set_header (MCA_BTL_VADER_FBOX_HDR(dst), tag, ep->fbox_out.seq++, data_size);
-
end += size;
if (OPAL_UNLIKELY(fbox_size == end)) {
@@ -152,6 +149,9 @@ static inline bool mca_btl_vader_fbox_sendi (mca_btl_base_endpoint_t *ep, unsign
MCA_BTL_VADER_FBOX_HDR(ep->fbox_out.buffer + end)->ival = 0;
}
+ /* write out part of the header now. the tag will be written when the data is available */
+ mca_btl_vader_fbox_set_header (MCA_BTL_VADER_FBOX_HDR(dst), tag, ep->fbox_out.seq++, data_size);
+
/* align the buffer */
ep->fbox_out.end = ((uint32_t) hbs << 31) | end;
opal_atomic_wmb ();
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