diff --git a/mongodb_field_storage/mongodb_field_storage.module b/mongodb_field_storage/mongodb_field_storage.module
index 1be9622..84c062c 100644
--- a/mongodb_field_storage/mongodb_field_storage.module
+++ b/mongodb_field_storage/mongodb_field_storage.module
@@ -364,7 +364,7 @@ function mongodb_field_storage_query($query) {
     $fieldName = $data['field']['field_name'] . '.' . $data['column'];
     $type = $data['field']['columns'][$data['column']]['type'];
     if (isset($find[$fieldName])) {
-      $find[$fieldName] = array_merge($find[$fieldName], _mongodb_field_storage_query_value($data['value'], $data['operator'], $type));
+      $find[$fieldName] = array_merge($find[$fieldName], (array)_mongodb_field_storage_query_value($data['value'], $data['operator'], $type));
     }
     else {
       $find[$data['field']['field_name'] . '.' . $data['column']] = _mongodb_field_storage_query_value($data['value'], $data['operator'], $type);