diff --git a/ompi/mca/io/ompio/io_ompio.c b/ompi/mca/io/ompio/io_ompio.c
index e6e85accff..a4f9bc5673 100644
--- a/ompi/mca/io/ompio/io_ompio.c
+++ b/ompi/mca/io/ompio/io_ompio.c
@@ -2040,10 +2040,10 @@ int mca_io_ompio_create_groups(mca_io_ompio_file_t *fh,
     //Gather start offsets across processes in a group on aggregator
     ompi_io_ompio_allgather_array (start_offset_len,
                                    3,
-        		           MPI_LONG,       
+        		           OMPI_OFFSET_DATATYPE,       
 				   start_offsets_lens,
 				   3,
-				   MPI_LONG,
+				   OMPI_OFFSET_DATATYPE,
 				   0,
 				   fh->f_init_procs_in_group,
 				   fh->f_init_procs_per_group,