diff --git a/biblio.admin.inc b/biblio.admin.inc
index be836ad..6fdd79f 100644
--- a/biblio.admin.inc
+++ b/biblio.admin.inc
@@ -364,6 +364,14 @@ function biblio_admin_settings() {
     )
   );
 
+  $form['sort']['biblio_secondary_sort_by_tid'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Sort by year : secondary sort by type id'),
+    '#return_value' => 1,
+    '#default_value' => variable_get('biblio_secondary_sort_by_tid', 1),
+    '#description' => t('When sorting by type, second sorting criterion is type id instead of type name')
+    );
+
   $form['sort']['biblio_enumerate_references'] = array(
     '#type' => 'checkbox',
     '#title' => t('Enumerate references'),
diff --git a/biblio.pages.inc b/biblio.pages.inc
index 5975fcf..623bec9 100644
--- a/biblio.pages.inc
+++ b/biblio.pages.inc
@@ -133,7 +133,10 @@ function biblio_build_query($arg_list) {
 
   switch ($sort_attrib['sort']) {
     case 'type':
-      $sortby = "ORDER BY bt.name %s, b.biblio_year DESC ";
+      if (variable_get('biblio_secondary_sort_by_tid',0))
+        $sortby = "ORDER BY bt.tid %s, b.biblio_year DESC ";
+      else
+        $sortby = "ORDER BY bt.name %s, b.biblio_year DESC ";      
       break;
     case 'title':
       //$sortby = "ORDER BY SUBSTRING(n.title,1,3) %s, b.biblio_year DESC ";