diff --git a/lib/ace/virtual_renderer.js b/lib/ace/virtual_renderer.js
index f08e24cb..3c992d20 100644
--- a/lib/ace/virtual_renderer.js
+++ b/lib/ace/virtual_renderer.js
@@ -1374,9 +1374,8 @@ var VirtualRenderer = function(container, theme) {
         var col = Math.round(
             (x + this.scrollLeft - canvasPos.left - this.$padding) / this.characterWidth
         );
-        var row = Math.floor(
-            (y + this.scrollTop - canvasPos.top) / this.lineHeight
-        );
+
+        var row = (y + this.scrollTop - canvasPos.top) / this.lineHeight;
 
         return this.session.screenToDocumentPosition(row, Math.max(col, 0));
     };