diff --git a/test/unit/styling-scoped.html b/test/unit/styling-scoped.html
index 6bcdaa66..df39a933 100644
--- a/test/unit/styling-scoped.html
+++ b/test/unit/styling-scoped.html
@@ -231,6 +231,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
       test('svg elements properly scoped', function() {
         assert.include(styled.$.circle.getAttribute('class'), 'style-scope x-styled');
+        assert.notInclude(styled.$.circle.getAttribute('class'), 'null');
         assertComputed(styled.$.circle, '1px', 'strokeWidth');
       });