diff --git a/jquery.slimscroll.js b/jquery.slimscroll.js
index 1c6a53b..7006a5e 100644
--- a/jquery.slimscroll.js
+++ b/jquery.slimscroll.js
@@ -368,7 +368,7 @@
           if (isJump)
           {
             delta = y;
-            var offsetTop = delta / me[0].scrollHeight * me.outerHeight();
+            var offsetTop = (delta / me[0].scrollHeight) * (me.outerHeight() - bar.height());
             offsetTop = Math.min(Math.max(offsetTop, 0), maxTop);
             bar.css({ top: offsetTop + 'px' });
           }