diff --git a/htdocs/core/actions_addupdatedelete.inc.php b/htdocs/core/actions_addupdatedelete.inc.php
index 548fcb21b79..45f0fb8613e 100644
--- a/htdocs/core/actions_addupdatedelete.inc.php
+++ b/htdocs/core/actions_addupdatedelete.inc.php
@@ -164,7 +164,7 @@ if ($action == 'update' && !empty($permissiontoadd))
 		} elseif (preg_match('/^(integer|price|real|double)/', $object->fields[$key]['type'])) {
 			$value = price2num(GETPOST($key, 'alphanohtml')); // To fix decimal separator according to lang setup
 		} elseif ($object->fields[$key]['type'] == 'boolean') {
-			$value = (GETPOST($key) == '1' ? 1 : 0);
+			$value = ((GETPOST($key, 'aZ09') == 'on' || GETPOST($key, 'aZ09') == '1') ? 1 : 0);
 		} elseif ($object->fields[$key]['type'] == 'reference') {
 			$value = array_keys($object->param_list)[GETPOST($key)].','.GETPOST($key.'2');
 		} else {