diff --git a/src/templates_hdf5/templator_hdf5.org b/src/templates_hdf5/templator_hdf5.org
index cff65aa..85c7537 100644
--- a/src/templates_hdf5/templator_hdf5.org
+++ b/src/templates_hdf5/templator_hdf5.org
@@ -413,13 +413,13 @@ trexio_hdf5_has_$group_dset$ (trexio_t* const file)
 
    #+begin_src c :tangle hrw_dset_str_hdf5.h :exports none
 trexio_exit_code trexio_hdf5_has_$group_dset$(trexio_t* const file);
-trexio_exit_code trexio_hdf5_read_$group_dset$(trexio_t* const file, $group_dset_dtype$* const $group_dset$, const uint32_t rank, const uint64_t* dims);
-trexio_exit_code trexio_hdf5_write_$group_dset$(trexio_t* const file, const $group_dset_dtype$* $group_dset$, const uint32_t rank, const uint64_t* dims);
+trexio_exit_code trexio_hdf5_read_$group_dset$(trexio_t* const file, char** const $group_dset$, const uint32_t rank, const uint64_t* dims);
+trexio_exit_code trexio_hdf5_write_$group_dset$(trexio_t* const file, const char** $group_dset$, const uint32_t rank, const uint64_t* dims);
    #+end_src
 
    #+begin_src c :tangle read_dset_str_hdf5.c
 trexio_exit_code
-trexio_hdf5_read_$group_dset$ (trexio_t* const file, $group_dset_dtype$* const $group_dset$, const uint32_t rank, const uint64_t* dims)
+trexio_hdf5_read_$group_dset$ (trexio_t* const file, char** const $group_dset$, const uint32_t rank, const uint64_t* dims)
 {
 
   if (file == NULL) return TREXIO_INVALID_ARG_1;
@@ -486,7 +486,7 @@ trexio_hdf5_read_$group_dset$ (trexio_t* const file, $group_dset_dtype$* const $
 
    #+begin_src c :tangle write_dset_str_hdf5.c
 trexio_exit_code
-trexio_hdf5_write_$group_dset$ (trexio_t* const file, const $group_dset_dtype$* $group_dset$, const uint32_t rank, const uint64_t* dims)
+trexio_hdf5_write_$group_dset$ (trexio_t* const file, const char** $group_dset$, const uint32_t rank, const uint64_t* dims)
 {
 
   if (file == NULL) return TREXIO_INVALID_ARG_1;