diff --git a/core/lib/Drupal/Core/Database/Query/SelectExtender.php b/core/lib/Drupal/Core/Database/Query/SelectExtender.php
index 111fbe5..73952d0 100644
--- a/core/lib/Drupal/Core/Database/Query/SelectExtender.php
+++ b/core/lib/Drupal/Core/Database/Query/SelectExtender.php
@@ -321,6 +321,13 @@ public function execute() {
    * {@inheritdoc}
    */
   public function executeTemporary() {
+    // By calling preExecute() here, we force it to preprocess the extender
+    // object rather than just the base query object.  That means
+    // hook_query_alter() gets access to the extended object.
+    if (!$this->preExecute($this)) {
+      return NULL;
+    }
+
     return $this->query->executeTemporary();
   }