diff --git a/lib/classes/API/V1/adapter.php b/lib/classes/API/V1/adapter.php
index 1fa8c4b5cd..fafa1c2e49 100644
--- a/lib/classes/API/V1/adapter.php
+++ b/lib/classes/API/V1/adapter.php
@@ -494,7 +494,8 @@ class API_V1_adapter extends API_V1_Abstract
                 throw new API_V1_exception_badrequest(sprintf('Invalid forceBehavior value `%s`', $request->get('forceBehavior')));
                 break;
         }
-        $app['border-manager']->process($session, $Package, $callback, $behavior, $request->get('nosubdefs')==='');
+        $nosubdef = $request->get('nosubdefs')==='' || \p4field::isyes($request->get('nosubdefs'));
+        $app['border-manager']->process($session, $Package, $callback, $behavior, $nosubdef);
 
         $ret = array(
             'entity' => null,