diff --git a/lib/ace/virtual_renderer.js b/lib/ace/virtual_renderer.js
index 28154f15..a80e80d8 100644
--- a/lib/ace/virtual_renderer.js
+++ b/lib/ace/virtual_renderer.js
@@ -615,7 +615,7 @@ var VirtualRenderer = function(container, theme) {
 
         var col = Math.round((pageX + this.scroller.scrollLeft - canvasPos.left - this.$padding)
                 / this.characterWidth);
-        var row = Math.floor((pageY + this.scrollTop - canvasPos.top)
+        var row = Math.floor((pageY + this.scrollTop - canvasPos.top - window.pageYOffset)
                 / this.lineHeight);
 
         return this.session.screenToDocumentPosition(row, Math.max(col, 0));