diff --git a/test/runner.html b/test/runner.html
index d2b1c2a3b0..d81de3f2df 100644
--- a/test/runner.html
+++ b/test/runner.html
@@ -96,6 +96,7 @@
       'unit/html-tag.html',
       'unit/legacy-data.html',
       'unit/legacy-undefined.html',
+      'unit/legacy-noattributes.html',
       // 'unit/multi-style.html'
       'unit/class-properties.html',
       'unit/styling-scoped-nopatch.html'
diff --git a/test/unit/legacy-noattributes.html b/test/unit/legacy-noattributes.html
index bcaa0037e5..1e25a99570 100644
--- a/test/unit/legacy-noattributes.html
+++ b/test/unit/legacy-noattributes.html
@@ -15,8 +15,9 @@
   <script src="wct-browser-config.js"></script>
   <script src="../../node_modules/wct-browser-legacy/browser.js"></script>
   <script type="module">
-    import {setLegacyNoObservedAttributes} from '../../lib/utils/settings.js';
+    import {setLegacyNoObservedAttributes, setLegacyOptimizations} from '../../lib/utils/settings.js';
     setLegacyNoObservedAttributes(true);
+    setLegacyOptimizations(true);
   </script>
 </head>
 <body>
