diff --git a/core/modules/migrate_drupal_ui/src/Tests/MigrateUpgradeTestBase.php b/core/modules/migrate_drupal_ui/src/Tests/MigrateUpgradeTestBase.php
index 782e384..b3e74de 100644
--- a/core/modules/migrate_drupal_ui/src/Tests/MigrateUpgradeTestBase.php
+++ b/core/modules/migrate_drupal_ui/src/Tests/MigrateUpgradeTestBase.php
@@ -132,7 +132,7 @@ protected function testMigrateUpgrade() {
 
     // Ensure submitting the form with invalid credentials gives us a nice
     // warning.
-    $this->drupalPostForm(NULL, ['mysql[password]' => 'wrong'] + $edits, t('Review upgrade'));
+    $this->drupalPostForm(NULL, [$driver . '[password]' => 'wrong'] + $edits, t('Review upgrade'));
     $this->assertText('Resolve the issue below to continue the upgrade.');
     $this->assertText('Access denied for user');