diff --git a/test/unit/inheritance.html b/test/unit/inheritance.html
index 497bed3b08..be78f49ca3 100644
--- a/test/unit/inheritance.html
+++ b/test/unit/inheritance.html
@@ -269,7 +269,7 @@
     });
 
     test('returning null nullifies the parent template', function() {
-      assert.isNotOk(el.shadowRoot);
+      assert.equal(el.shadowRoot, null);
     });
   });
   </script>