diff --git a/core/modules/block/lib/Drupal/block/Tests/BlockLanguageCacheTest.php b/core/modules/block/lib/Drupal/block/Tests/BlockLanguageCacheTest.php
index 2acacf0..5fec407 100644
--- a/core/modules/block/lib/Drupal/block/Tests/BlockLanguageCacheTest.php
+++ b/core/modules/block/lib/Drupal/block/Tests/BlockLanguageCacheTest.php
@@ -73,7 +73,7 @@ public function testBlockLinks() {
     // Create a menu in the default language.
     $edit['label'] = $this->randomName();
     $edit['id'] = Unicode::strtolower($edit['label']);
-    $this->drupalPost('admin/structure/menu/add', $edit, t('Save'));
+    $this->drupalPostForm('admin/structure/menu/add', $edit, t('Save'));
     $this->assertText(t('Menu @label has been added.', array('@label' => $edit['label'])));
 
     // Check that the block is listed for all languages.