diff --git a/radfield.cc b/radfield.cc
index 552dab3fd..4b06273b1 100644
--- a/radfield.cc
+++ b/radfield.cc
@@ -1268,7 +1268,7 @@ void reduce_estimators()
     for (int nonemptymgi = 0; nonemptymgi < nonempty_npts_model; nonemptymgi++) {
       MPI_Allreduce(MPI_IN_PLACE,
                     &bfrate_raw[static_cast<size_t>(nonemptymgi) * static_cast<size_t>(globals::bfestimcount)],
-                    globals::bfestimcount, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);
+                    globals::bfestimcount, MPI_DOUBLE, MPI_SUM, mpi_comm_node);
     }
 
     if (globals::rank_in_node == 0) {