diff --git a/nur_src/b/io/FileCachedValue.php b/nur_src/b/io/FileCachedValue.php
index 6905934..c988b36 100644
--- a/nur_src/b/io/FileCachedValue.php
+++ b/nur_src/b/io/FileCachedValue.php
@@ -5,6 +5,7 @@ use ArrayAccess;
 use Countable;
 use Exception;
 use Generator;
+use nulib\file\Stream;
 use nur\A;
 use nur\b\coll\TBaseArray;
 use nur\b\IllegalAccessException;
@@ -104,6 +105,7 @@ abstract class FileCachedValue extends Parametrable implements ArrayAccess, Coun
 
   /** désérialiser la données depuis le contenu spécifié */
   protected function unserialize(string $contents) {
+    $contents = Stream::nursery_compat_verifix($contents);
     return unserialize($contents);
   }
 
@@ -148,7 +150,7 @@ abstract class FileCachedValue extends Parametrable implements ArrayAccess, Coun
   }
 
   protected function loadInfos(): array {
-    [$tstart, $duration] = unserialize(fgets($this->fp));
+    [$tstart, $duration] = $this->unserialize(fgets($this->fp));
     if (is_int($tstart)) {
       $tstart = new DateTime($tstart);
       $duration = new Delay($duration, $tstart);