diff --git a/core/modules/entity/entity.api.php b/core/modules/entity/entity.api.php
index e983778..467fa85 100644
--- a/core/modules/entity/entity.api.php
+++ b/core/modules/entity/entity.api.php
@@ -224,7 +224,7 @@ function hook_entity_info_alter(&$entity_info) {
  * @param $type
  *   The type of entities being loaded (i.e. node, user, comment).
  */
-function hook_entity_load($entities, $type) {
+function hook_entity_load(&$entities, $type) {
   foreach ($entities as $entity) {
     $entity->foo = mymodule_add_something($entity, $type);
   }