diff --git a/htdocs/core/actions_addupdatedelete.inc.php b/htdocs/core/actions_addupdatedelete.inc.php
index 37a39e7d1f0..c3a93639a05 100644
--- a/htdocs/core/actions_addupdatedelete.inc.php
+++ b/htdocs/core/actions_addupdatedelete.inc.php
@@ -165,7 +165,7 @@ if ($action == 'update' && !empty($permissiontoadd))
 		} elseif (preg_match('/^(integer|price|real|double)/', $object->fields[$key]['type'])) {
             $value = price2num(GETPOST($key, 'none')); // To fix decimal separator according to lang setup
 		} elseif ($object->fields[$key]['type'] == 'boolean') {
-			$value = (GETPOST($key) == 'on' ? 1 : 0);
+			$value = (GETPOST($key) == '1' ? 1 : 0);
 		} else {
 			$value = GETPOST($key, 'alpha');
 		}