Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.441
diff -u -p -r1.441 form.inc
--- includes/form.inc	12 Mar 2010 14:38:37 -0000	1.441
+++ includes/form.inc	13 Mar 2010 10:00:09 -0000
@@ -1654,7 +1654,7 @@ function form_type_checkboxes_value($ele
     $value = array();
     $element += array('#default_value' => array());
     foreach ($element['#default_value'] as $key) {
-      $value[$key] = 1;
+      $value[$key] = $key;
     }
     return $value;
   }