diff --git a/php/src/file/Stream.php b/php/src/file/Stream.php
index 8f25c4b..f18463a 100644
--- a/php/src/file/Stream.php
+++ b/php/src/file/Stream.php
@@ -309,8 +309,27 @@ class Stream extends AbstractIterator implements IReader, IWriter {
     }
   }
 
+  /** @var bool faut-il faire un mapping pour la compatibilité avec nur/sery */
+  const UNSERIALIZE_NURSERY_COMPAT = true;
+
+  /**
+   * @var string[] mappings pour la compatibilité avec des fichiers générés par
+   * nur/sery
+   */
+  const UNSERIALIZE_NURSERY_MAPPING = [
+    'O:22:"nur\sery\php\time\Date":' => 'O:19:"nulib\php\time\Date":',
+    'O:26:"nur\sery\php\time\DateTime":' => 'O:23:"nulib\php\time\DateTime":',
+    'O:23:"nur\sery\php\time\Delay":' => 'O:20:"nulib\php\time\Delay":',
+  ];
+
   function unserialize(?array $options=null, bool $close=true, bool $alreadyLocked=false) {
-    $args = [$this->getContents($close, $alreadyLocked)];
+    $contents = $this->getContents($close, $alreadyLocked);
+    if (static::UNSERIALIZE_NURSERY_COMPAT) {
+      foreach (self::UNSERIALIZE_NURSERY_MAPPING as $from => $to) {
+        $contents = str_replace($from, $to, $contents);
+      }
+    }
+    $args = [$contents];
     if ($options !== null) $args[] = $options;
     return unserialize(...$args);
   }