diff --git a/examples/acroforms/forms.js b/examples/acroforms/forms.js
index 868825fc7..5327754c2 100644
--- a/examples/acroforms/forms.js
+++ b/examples/acroforms/forms.js
@@ -27,7 +27,7 @@ function setupForm(div, content, viewport) {
   }
   function createElementWithStyle(tagName, item) {
     var element = document.createElement(tagName);
-    var rect = Util.normalizeRect(
+    var rect = PDFJS.Util.normalizeRect(
       viewport.convertToViewportRectangle(item.rect));
     element.style.left = Math.floor(rect[0]) + 'px';
     element.style.top = Math.floor(rect[1]) + 'px';