diff --git a/src/Smalot/PdfParser/PDFObject.php b/src/Smalot/PdfParser/PDFObject.php
index 378ae15d..3b0e72cd 100644
--- a/src/Smalot/PdfParser/PDFObject.php
+++ b/src/Smalot/PdfParser/PDFObject.php
@@ -1210,6 +1210,6 @@ public static function factory(
      */
     protected function getUniqueId(): string
     {
-        return spl_object_hash($this);
+        return \PHP_VERSION_ID < 70200 ? \spl_object_hash($this) : (string) \spl_object_id($this);
     }
 }