diff --git a/test/runner.html b/test/runner.html
index 633fed9080..dbd34da051 100644
--- a/test/runner.html
+++ b/test/runner.html
@@ -79,7 +79,8 @@
       'unit/dir.html',
       'unit/disable-upgrade.html',
       'unit/shady-unscoped-style.html',
-      'unit/html-tag.html'
+      'unit/html-tag.html',
+      'unit/legacy-data-mixin.html'
       // 'unit/multi-style.html'
     ];