diff -u b/core/lib/Drupal/Core/Entity/EntityListController.php b/core/lib/Drupal/Core/Entity/EntityListController.php
--- b/core/lib/Drupal/Core/Entity/EntityListController.php
+++ b/core/lib/Drupal/Core/Entity/EntityListController.php
@@ -177,7 +177,7 @@
    */
   public function buildOperations(EntityInterface $entity) {
     // Retrieve and sort operations.
-    $operations = array_merge($this->moduleHandler->invokeAll('entity_operation', $entity), $this->getOperations($entity));
+    $operations = array_merge($this->moduleHandler->invokeAll('entity_operation', array($entity)), $this->getOperations($entity));
     $this->moduleHandler->alter('entity_operation', $operations, $entity);
     uasort($operations, '\Drupal\Component\Utility\SortArray::sortByWeightElement');
     $build = array(