use correct MPI type

diff --git a/source/base/data_out_base.cc b/source/base/data_out_base.cc
index 6108f647682b1f59ae42dd829adfde5f386d97d6..62530545c9312e1ca6154aaed659e9a32b91c320 100644 (file)
--- a/source/base/data_out_base.cc
+++ b/source/base/data_out_base.cc
@@ -8271,7 +8271,7 @@ DataOutInterface<dim, spacedim>::create_xdmf_entry(
         {
           // send to rank 0
           const std::vector<char> buffer = Utilities::pack(entry, false);
-          ierr = MPI_Send(buffer.data(), buffer.size(), MPI_CHAR, 0, tag, comm);
+          ierr = MPI_Send(buffer.data(), buffer.size(), MPI_BYTE, 0, tag, comm);
           AssertThrowMPI(ierr);
 
           return {};