diff --git a/tests/application/modules/opac/controllers/NoticeAjaxControllerTest.php b/tests/application/modules/opac/controllers/NoticeAjaxControllerTest.php
index 2edb7010273ce43be18b4d26e29fa3c1e136a513..6d7e40922d942a44aa214f8ab2bd2c62f5a3cf99 100644
--- a/tests/application/modules/opac/controllers/NoticeAjaxControllerTest.php
+++ b/tests/application/modules/opac/controllers/NoticeAjaxControllerTest.php
@@ -1853,7 +1853,7 @@ class NoticeAjaxControllerBiographieNonTrouveeTest extends NoticeAjaxControllerB
 
 
 abstract class NoticeAjaxControllerLocalisationTestCase extends AbstractControllerTestCase {
-  protected $_json;
+  protected $_json, $_storm_default_to_volatile = true;
 
 
   public function setUp() {