diff --git a/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php b/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
index 9be21090..f5ffb8ae 100644
--- a/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
+++ b/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
@@ -395,7 +395,7 @@ public function testSerialization() {
    */
   public function testLegacyConstructor() {
     $container = new ContainerBuilder();
-    $current_user = $this->getMock(AccountProxyInterface::class);
+    $current_user = $this->createMock(AccountProxyInterface::class);
     $container->set('current_user', $current_user);
     \Drupal::setContainer($container);
     $store = new SharedTempStore($this->keyValue, $this->lock, 2, $this->requestStack, 1000);