diff --git a/js/affix.js b/js/affix.js
index c7be96e1dd..84760779d5 100644
--- a/js/affix.js
+++ b/js/affix.js
@@ -57,8 +57,8 @@
     var offsetBottom = offset.bottom
 
     if (typeof offset != 'object')         offsetBottom = offsetTop = offset
-    if (typeof offsetTop == 'function')    offsetTop    = offset.top()
-    if (typeof offsetBottom == 'function') offsetBottom = offset.bottom()
+    if (typeof offsetTop == 'function')    offsetTop    = offset.top(this.$element)
+    if (typeof offsetBottom == 'function') offsetBottom = offset.bottom(this.$element)
 
     var affix = this.unpin   != null && (scrollTop + this.unpin <= position.top) ? false :
                 offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ? 'bottom' :