diff --git a/htdocs/admin/ihm.php b/htdocs/admin/ihm.php
index 83f7b03d67f..19c0bab7150 100644
--- a/htdocs/admin/ihm.php
+++ b/htdocs/admin/ihm.php
@@ -154,8 +154,8 @@ if ($action == 'update')
 	//dolibarr_set_const($db, "MAIN_DISABLE_JAVASCRIPT", GETPOST("MAIN_DISABLE_JAVASCRIPT", 'aZ09'), 'chaine', 0, '', $conf->entity);
 	dolibarr_set_const($db, "MAIN_BUTTON_HIDE_UNAUTHORIZED", GETPOST("MAIN_BUTTON_HIDE_UNAUTHORIZED", 'aZ09'), 'chaine', 0, '', $conf->entity);
 	dolibarr_set_const($db, "MAIN_START_WEEK", GETPOST("MAIN_START_WEEK", 'int'), 'chaine', 0, '', $conf->entity);
-	dolibarr_set_const($db, "MAIN_DEFAULT_WORKING_DAYS", GETPOST("MAIN_DEFAULT_WORKING_DAYS", 'int'), 'chaine', 0, '', $conf->entity);
-	dolibarr_set_const($db, "MAIN_DEFAULT_WORKING_HOURS", GETPOST("MAIN_DEFAULT_WORKING_HOURS", 'int'), 'chaine', 0, '', $conf->entity);
+	dolibarr_set_const($db, "MAIN_DEFAULT_WORKING_DAYS", GETPOST("MAIN_DEFAULT_WORKING_DAYS", 'alpha'), 'chaine', 0, '', $conf->entity);
+	dolibarr_set_const($db, "MAIN_DEFAULT_WORKING_HOURS", GETPOST("MAIN_DEFAULT_WORKING_HOURS", 'alpha'), 'chaine', 0, '', $conf->entity);
 	dolibarr_set_const($db, "MAIN_SHOW_LOGO", GETPOST("MAIN_SHOW_LOGO", 'aZ09'), 'chaine', 0, '', $conf->entity);
 	dolibarr_set_const($db, "MAIN_FIRSTNAME_NAME_POSITION", GETPOST("MAIN_FIRSTNAME_NAME_POSITION", 'aZ09'), 'chaine', 0, '', $conf->entity);