--- a/VTK/ThirdParty/h5part/vtkh5part/src/H5PartTypes.h	2020-10-12 17:56:08.942848601 -0400
+++ b/VTK/ThirdParty/h5part/vtkh5part/src/H5PartTypes.h	2020-10-12 17:56:50.656772295 -0400
@@ -19,7 +19,7 @@
 #endif
  ;
 
-#ifndef PARALLEL_IO
+#if !(defined(PARALLEL_IO) || defined(H5_HAVE_PARALLEL))
 typedef unsigned long		MPI_Comm;
 #endif