diff --git includes/form.inc includes/form.inc
index e571769..bef7796 100644
--- includes/form.inc
+++ includes/form.inc
@@ -2798,6 +2798,9 @@ function theme_tableselect($variables) {
       drupal_add_js('misc/tableselect.js');
       array_unshift($header, array('class' => array('select-all')));
     }
+    else {
+       array_unshift($header, '');
+    }
   }
   return theme('table', array('header' => $header, 'rows' => $rows, 'empty' => $element['#empty'], 'attributes' => $element['#attributes']));
 }