diff --git a/js/affix.js b/js/affix.js
index 992ae7ff1786..270b039bf10d 100644
--- a/js/affix.js
+++ b/js/affix.js
@@ -82,7 +82,7 @@
       .trigger($.Event(affixType.replace('affix', 'affixed')))
 
     if (affix == 'bottom') {
-      this.$element.offset({ top: position.top })
+      this.$element.offset({ top: scrollHeight - this.$element.height() - offsetBottom })
     }
   }