--- sf_node.module (saved version)
+++ (current document)
@@ -384,7 +384,7 @@
 function _sf_node_export_cck_checkbox($source, $field) {
   $data = $source->$field;
   if (empty($source->{$field}[0]['value'])) {
-    return 'false';
+    return 0;
   }
   else {
     return 1;