diff --git a/jquery.mousewheel.js b/jquery.mousewheel.js
index 4c2178c95..b2a6a9c45 100755
--- a/jquery.mousewheel.js
+++ b/jquery.mousewheel.js
@@ -58,7 +58,7 @@
         },
 
         getLineHeight: function(elem) {
-          return parseInt($(elem)['offsetParent' in jQuery.fn ? 'offsetParent' : 'parent']().css('fontSize'), 10);
+          return parseInt($(elem)['offsetParent' in $.fn ? 'offsetParent' : 'parent']().css('fontSize'), 10);
         },
 
         getPageHeight: function(elem) {