diff --git a/tests/ExporterTest.php b/tests/ExporterTest.php
index 3a93f1f..fa16835 100644
--- a/tests/ExporterTest.php
+++ b/tests/ExporterTest.php
@@ -58,7 +58,7 @@ final class ExporterTest extends TestCase
         $obj->self        = $obj;
 
         $storage = new SplObjectStorage;
-        $storage->attach($obj2);
+        $storage->offsetSet($obj2);
 
         $resource = fopen('php://memory', 'r');
         fclose($resource);