diff --git a/Source/Fortran/DataTypesModule.F90 b/Source/Fortran/DataTypesModule.F90
index e819c3ed..b32e6971 100644
--- a/Source/Fortran/DataTypesModule.F90
+++ b/Source/Fortran/DataTypesModule.F90
@@ -19,6 +19,6 @@ MODULE DataTypesModule
   !> MPI Integer type we will use in this program.
   INTEGER, PARAMETER, PUBLIC :: MPINTINTEGER = MPI_INTEGER
   !> MPI Integer type we will use in this program.
-  INTEGER, PARAMETER, PUBLIC :: MPINTLONG = MPI_INTEGER8
+  INTEGER, PARAMETER, PUBLIC :: MPINTLONG = MPI_INTEGER4
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 END MODULE DataTypesModule