diff --git a/core/modules/search/tests/src/Functional/SearchAdminThemeTest.php b/core/modules/search/tests/src/Functional/SearchAdminThemeTest.php
index fc15f0f1a9..91ce3d0bd7 100644
--- a/core/modules/search/tests/src/Functional/SearchAdminThemeTest.php
+++ b/core/modules/search/tests/src/Functional/SearchAdminThemeTest.php
@@ -19,6 +19,11 @@ class SearchAdminThemeTest extends BrowserTestBase {
    */
   protected static $modules = ['node', 'search', 'search_extra_type', 'user'];
 
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
   /**
    * The administration theme name.
    *