diff --git a/Makefile.am b/Makefile.am
index 00622f2..3bd2623 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -117,7 +117,8 @@ TESTS_C = \
   tests/io_dset_str_text \
   tests/delete_group_text \
   tests/overwrite_all_text \
-  tests/io_all
+  tests/io_all \
+  tests/pre_close
 
 if HAVE_HDF5
 TESTS_C += \
diff --git a/src/templates_front/templator_front.org b/src/templates_front/templator_front.org
index 0e00be8..f060bfa 100644
--- a/src/templates_front/templator_front.org
+++ b/src/templates_front/templator_front.org
@@ -1422,7 +1422,7 @@ trexio_pre_close (trexio_t* file)
       rc = trexio_read_electron_dn_num(file, &ndn);
       if (rc != TREXIO_SUCCESS) return rc;
       
-      rc = trexio_read_electron_elec_num(file, &nelec);
+      rc = trexio_read_electron_num(file, &nelec);
       if (rc != TREXIO_SUCCESS) return rc;
       
       if (nelec != nup + ndn) {
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 26b3634..52f47a1 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -13,6 +13,7 @@ set(Tests_text
   io_str_text
   delete_group_text
   overwrite_all_text
+  pre_close.c
   )
 
 if(ENABLE_HDF5)
@@ -28,6 +29,7 @@ if(ENABLE_HDF5)
     io_str_hdf5
     delete_group_hdf5
     overwrite_all_hdf5
+    pre_close
     )
 
 # Set ${Tests} variable to the complete list of tests.
diff --git a/tests/pre_close.c b/tests/pre_close.c
new file mode 100644
index 0000000..ec5edac
--- /dev/null
+++ b/tests/pre_close.c
@@ -0,0 +1,124 @@
+#include "trexio.h"
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#define TEST_BACKEND  TREXIO_TEXT
+#define TREXIO_FILE   "test_dset_sparse.dir"
+#define RM_COMMAND    "rm -rf " TREXIO_FILE
+
+static int test_pre_close_1 (const char* file_name, const back_end_t backend)
+{
+/* Check if nelec = nup + ndn */
+
+  trexio_t* file = NULL;
+  trexio_exit_code rc;
+
+/*================= START OF TEST ==================*/
+
+  // open file in 'write' mode
+  file = trexio_open(file_name, 'w', backend, &rc);
+  assert (file != NULL);
+  assert (rc == TREXIO_SUCCESS);
+
+  // write parameters
+  int32_t nup = 4;
+  int32_t ndn = 3;
+  int32_t nelec = 0;
+
+  rc = trexio_write_electron_up_num(file, nup);
+  assert (rc == TREXIO_SUCCESS);
+
+  rc = trexio_write_electron_dn_num(file, ndn);
+  assert (rc == TREXIO_SUCCESS);
+
+  // close file
+  rc = trexio_close(file);
+  assert (rc == TREXIO_SUCCESS);
+
+
+  // re-open file
+  file = trexio_open(file_name, 'r', backend, &rc);
+  assert (file != NULL);
+  assert (rc == TREXIO_SUCCESS);
+
+  rc = trexio_read_electron_num(file, &nelec);
+  assert (rc == TREXIO_SUCCESS);
+  printf("nup  : %d\n", nup);
+  printf("ndn  : %d\n", ndn);
+  printf("nelec: %d\n", nelec);
+  assert (nelec == nup + ndn);
+
+  // close file
+  rc = trexio_close(file);
+  assert (rc == TREXIO_SUCCESS);
+
+/*================= END OF TEST ==================*/
+
+  return 0;
+}
+
+static int test_pre_close_2 (const char* file_name, const back_end_t backend)
+{
+/* Check if nelec = nup */
+
+  trexio_t* file = NULL;
+  trexio_exit_code rc;
+
+/*================= START OF TEST ==================*/
+
+  // open file in 'write' mode
+  file = trexio_open(file_name, 'w', backend, &rc);
+  assert (file != NULL);
+  assert (rc == TREXIO_SUCCESS);
+
+  // write parameters
+  int32_t nup = 4;
+  int32_t nelec = 0;
+
+  rc = trexio_write_electron_up_num(file, nup);
+  assert (rc == TREXIO_SUCCESS);
+
+  // close file
+  rc = trexio_close(file);
+  assert (rc == TREXIO_SUCCESS);
+
+
+  // re-open file
+  file = trexio_open(file_name, 'r', backend, &rc);
+  assert (file != NULL);
+  assert (rc == TREXIO_SUCCESS);
+
+  rc = trexio_read_electron_num(file, &nelec);
+  assert (rc == TREXIO_SUCCESS);
+  assert (nelec == nup);
+
+  // close file
+  rc = trexio_close(file);
+  assert (rc == TREXIO_SUCCESS);
+
+/*================= END OF TEST ==================*/
+
+  return 0;
+}
+
+
+int main()
+{
+/*============== Test launcher ================*/
+
+  int rc;
+  rc = system(RM_COMMAND);
+  assert (rc == 0);
+
+  test_pre_close_1 (TREXIO_FILE, TEST_BACKEND);
+  rc = system(RM_COMMAND);
+
+  test_pre_close_2 (TREXIO_FILE, TEST_BACKEND);
+
+  rc = system(RM_COMMAND);
+  assert (rc == 0);
+
+  return 0;
+}