diff --git a/ompi/mpi/f77/type_create_struct_f.c b/ompi/mpi/f77/type_create_struct_f.c
index f651e3b293..ed22670aaf 100644
--- a/ompi/mpi/f77/type_create_struct_f.c
+++ b/ompi/mpi/f77/type_create_struct_f.c
@@ -73,8 +73,7 @@ void mpi_type_create_struct_f(MPI_Fint *count,
     int i;
     OMPI_ARRAY_NAME_DECL(array_of_block_lengths);
 
-    c_type_old_array = malloc(*count * (sizeof(MPI_Datatype) + 
-                                        sizeof(MPI_Aint)));
+    c_type_old_array = malloc(*count * sizeof(MPI_Datatype));
     if (NULL == c_type_old_array) {
         *ierr = OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_NO_MEM,
                                        FUNC_NAME);