diff --git a/static/js/auto-complete.js b/static/js/auto-complete.js
index 3c184fba77..b7ddb77b7e 100644
--- a/static/js/auto-complete.js
+++ b/static/js/auto-complete.js
@@ -78,11 +78,11 @@ var autoComplete = (function(){
                     parentOffsetLeft = parentElement.getBoundingClientRect().left;
                     parentOffsetTop = parentElement.getBoundingClientRect().top;
                 } else {
-                    pageXOffset = window.pageXOffset;
-                    pageYOffset = window.pageYOffset;
+                    pageXOffset = window.pageXOffset || document.documentElement.scrollLeft;
+                    pageYOffset = window.pageYOffset || document.documentElement.scrollTop;
                 }
-                that.sc.style.left = Math.round(rect.left + (pageXOffset || document.documentElement.scrollLeft) + o.offsetLeft - parentOffsetLeft) + 'px';
-                that.sc.style.top = Math.round(rect.bottom + (pageYOffset || document.documentElement.scrollTop) + o.offsetTop - parentOffsetTop) + 'px';
+                that.sc.style.left = Math.round(rect.left + pageXOffset + o.offsetLeft - parentOffsetLeft) + 'px';
+                that.sc.style.top = Math.round(rect.bottom + pageYOffset + o.offsetTop - parentOffsetTop) + 'px';
                 that.sc.style.width = Math.round(rect.right - rect.left) + 'px'; // outerWidth
                 if (!resize) {
                     that.sc.style.display = 'block';