diff --git a/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php b/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php
index fa73fcf81e..b3baf6e2d3 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/LegacyJavascriptTestBase.php
@@ -2,7 +2,7 @@
 
 namespace Drupal\FunctionalJavascriptTests;
 
-use Drupal\Tests\BrowserTestBase;
+use Zumba\Mink\Driver\PhantomJSDriver;
 
 /**
  * Runs a browser test using PhantomJS.
@@ -11,19 +11,10 @@
  */
 abstract class LegacyJavascriptTestBase extends JavascriptTestBase {
 
-  /**
-    * {@inheritdoc}
-    */
-  protected function getMinkDriverArgs() {
-    return getenv('MINK_DRIVER_ARGS_PHANTOMJS') ?: BrowserTestBase::getMinkDriverArgs();
-  }
-
   /**
    * {@inheritdoc}
    */
-  protected function getMinkDriverClass() {
-    return getenv('MINK_DRIVER_CLASS_PHANTOMJS') ?: BrowserTestBase::getMinkDriverClass();
-  }
+  protected $minkDefaultDriverClass = PhantomJSDriver::class;
 
   /**
    * {@inheritdoc}