diff -u b/sharethis.js b/sharethis.js
--- b/sharethis.js
+++ b/sharethis.js
@@ -4,10 +4,18 @@
       $('.sharethis-wrapper button').keypress(function (e) {
         // The enter key code (13).
         if (e.which == 13) {
-          var button = $(this).find('.stMainServices')[0];
+
+          // Find innermost span
+          var $target = $(this).children('span');
+          while ($target.length) {
+            $target = $target.children('span');
+          }
+          var button = $target.end()[0];
+
           if (typeof button !== 'undefined') {
             button.click();
           }
+
           return false;
         }
       });