diff --git a/tests/io_dset_int_hdf5.c b/tests/io_dset_int_hdf5.c
index 63d9db1..7d9e1a6 100644
--- a/tests/io_dset_int_hdf5.c
+++ b/tests/io_dset_int_hdf5.c
@@ -16,7 +16,7 @@ static int test_write_dset (const char* file_name, const back_end_t backend) {
 
   // parameters to be written
   int num = 12;
-  int nucl_index[12] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
+  int nucl_index[12] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
 
 /*================= START OF TEST ==================*/
 
@@ -99,7 +99,7 @@ static int test_read_dset (const char* file_name, const back_end_t backend) {
   nucl_index = (int*) calloc(num, sizeof(int));
   rc = trexio_read_basis_nucleus_index(file, nucl_index);
   assert (rc == TREXIO_SUCCESS);
-  assert ( nucl_index[num-1] == num );
+  assert (nucl_index[num-1] == num-1);
 
   free(nucl_index);
 
@@ -125,7 +125,7 @@ int main(void) {
   test_has_dset   (TREXIO_FILE, TEST_BACKEND);
   test_read_dset  (TREXIO_FILE, TEST_BACKEND);
 
-  //rc = system(RM_COMMAND);
+  rc = system(RM_COMMAND);
   assert (rc == 0);
 
   return 0;
diff --git a/tests/io_dset_int_text.c b/tests/io_dset_int_text.c
index 60f5558..1544327 100644
--- a/tests/io_dset_int_text.c
+++ b/tests/io_dset_int_text.c
@@ -16,7 +16,7 @@ static int test_write_dset (const char* file_name, const back_end_t backend) {
 
   // parameters to be written
   int num = 12;
-  int nucl_index[12] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
+  int nucl_index[12] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
 
 /*================= START OF TEST ==================*/
 
@@ -99,7 +99,7 @@ static int test_read_dset (const char* file_name, const back_end_t backend) {
   nucl_index = (int*) calloc(num, sizeof(int));
   rc = trexio_read_basis_nucleus_index(file, nucl_index);
   assert (rc == TREXIO_SUCCESS);
-  assert ( nucl_index[num-1] == num );
+  assert (nucl_index[num-1] == num-1);
 
   free(nucl_index);