diff --git a/nur_src/b/io/FileCachedValue.php b/nur_src/b/io/FileCachedValue.php
index c988b36..66aff97 100644
--- a/nur_src/b/io/FileCachedValue.php
+++ b/nur_src/b/io/FileCachedValue.php
@@ -287,10 +287,10 @@ abstract class FileCachedValue extends Parametrable implements ArrayAccess, Coun
   }
 
   /** supprimer le fichier s'il a expiré */
-  function deleteExpired(): bool {
+  function deleteExpired(bool $force=false): bool {
     try {
-      if ($this->shouldUpdate()) {
-        unlink($this->ppFile);
+      if ($force || $this->shouldUpdate()) {
+        @unlink($this->ppFile);
         return true;
       }
     } finally {