diff --git a/tests/framework/web/session/SessionTest.php b/tests/framework/web/session/SessionTest.php
index 1270aa4afe..7dfe1f17d9 100644
--- a/tests/framework/web/session/SessionTest.php
+++ b/tests/framework/web/session/SessionTest.php
@@ -65,6 +65,7 @@ class SessionTest extends TestCase
             $this->assertNotEquals($oldUseCookies, $newUseCookies);
             $this->assertFalse($newUseCookies);
         }
+        $session->setUseCookies($oldUseCookies);
 
         $oldGcProbability = $session->getGCProbability();
         $session->setGCProbability(100);