diff --git a/tests/ExporterTest.php b/tests/ExporterTest.php
index 0fde3bb..5d2a283 100644
--- a/tests/ExporterTest.php
+++ b/tests/ExporterTest.php
@@ -65,7 +65,7 @@ class ExporterTest extends TestCase
 
         $storage = new SplObjectStorage;
         $storage->attach($obj2);
-        $storage->foo = $obj2;
+        @$storage->foo = $obj2;
 
         $resource = fopen('php://memory', 'r');
         fclose($resource);