diff --git a/boxes/boxes.module b/boxes/boxes.module
index eaae276..08b41e7 100644
--- a/boxes/boxes.module
+++ b/boxes/boxes.module
@@ -744,6 +744,9 @@ function boxes_context_block_info_alter(&$blocks) {
  * Provides spaces integration for per-space overrides of a given box.
  */
 function boxes_boxes_box_load_alter(&$box, $delta) {
+  if (!$delta) {
+    $delta = $box->delta;
+  }
   if (module_exists('spaces') && $space = spaces_get_space()) {
     if ($space_box = $space->controllers->boxes->get($delta)) {
       // Some older overrides may be stored as an array, check for these and