diff --git a/sharethis.module b/sharethis.module
index 7242aa5..1c2c003 100644
--- a/sharethis.module
+++ b/sharethis.module
@@ -318,7 +318,7 @@ function theme_sharethis($variables) {
       'class' => 'st_' . $display . $type,
     );
     if ($serviceCodeName == 'twitter') {
-      if (!empty($data_options['twitter_handle'])) {
+      if (isset($data_options['twitter_handle'])) {
         $attributes['st_via'] = $data_options['twitter_handle'];
         $attributes['st_username'] = $data_options['twitter_recommends'];
       }