diff --git a/lib/ace/mouse/default_gutter_handler.js b/lib/ace/mouse/default_gutter_handler.js
index 9437d2e4..1ad8119c 100644
--- a/lib/ace/mouse/default_gutter_handler.js
+++ b/lib/ace/mouse/default_gutter_handler.js
@@ -113,11 +113,12 @@ function GutterHandler(mouseHandler) {
         var rect = editor.renderer.$gutter.getBoundingClientRect();
         tooltip.style.left = e.x + 15 + "px";
         if (e.y + 3 * editor.renderer.lineHeight + 15 < rect.bottom) {
-            tooltip.style.bottom =  "";
+            tooltip.style.bottom = "";
             tooltip.style.top =  e.y + 15 + "px";
         } else {
-            tooltip.style.top =  "";
-            tooltip.style.bottom = rect.bottom - e.y + 5 + "px";
+            tooltip.style.top = "";
+            var innerHeight = window.innerHeight || document.documentElement.clientHeight;
+            tooltip.style.bottom = innerHeight - e.y + 5 + "px";
         }
     }