diff --git a/src/test/html/color-change-text.js b/src/test/html/color-change-text.js
index c0c47837b04..41b9e3881cf 100644
--- a/src/test/html/color-change-text.js
+++ b/src/test/html/color-change-text.js
@@ -1,3 +1,3 @@
 window.setTimeout(function () {
-    document.getElementsByTagName('div')[0].setAttribute('class', 'blue');
+    window.document.getElementsByTagName('div')[0].setAttribute('class', 'blue');
 }, 1000);