diff --git a/core/modules/simpletest/simpletest.theme.inc b/core/modules/simpletest/simpletest.theme.inc
index 40402df..59fed66 100644
--- a/core/modules/simpletest/simpletest.theme.inc
+++ b/core/modules/simpletest/simpletest.theme.inc
@@ -125,7 +125,7 @@ function theme_simpletest_test_table($variables) {
         'class' => array('simpletest-test-description', 'table-filter-text-source'),
       );
 
-      $rows[] = array('data' => $row, 'class' => array($test_class . '-test', ($open ? 'js-hide' : '')));
+      $rows[] = array('data' => $row, 'class' => array($test_class . '-test', ($open ? '' : 'js-hide')));
     }
     $js['simpletest-test-group-' . $test_class] = $current_js;
     unset($table[$key]);