diff --git a/src/Symfony/Bridge/PhpUnit/SymfonyTestsListener.php b/src/Symfony/Bridge/PhpUnit/SymfonyTestsListener.php
index f85dbb367c..2dad6ef009 100644
--- a/src/Symfony/Bridge/PhpUnit/SymfonyTestsListener.php
+++ b/src/Symfony/Bridge/PhpUnit/SymfonyTestsListener.php
@@ -16,7 +16,7 @@ use PHPUnit\Framework\Test;
 use PHPUnit\Framework\TestSuite;
 use PHPUnit\Framework\Warning;
 
-if (class_exists('PHPUnit_Framework_BaseTestListener')) {
+if (class_exists('PHPUnit_Runner_Version') && version_compare(\PHPUnit_Runner_Version::id(), '6.0.0', '<')) {
     class_alias('Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListener', 'Symfony\Bridge\PhpUnit\SymfonyTestsListener');
 
     return;
diff --git a/src/Symfony/Bridge/PhpUnit/TextUI/Command.php b/src/Symfony/Bridge/PhpUnit/TextUI/Command.php
index 77b617fdcc..408533292a 100644
--- a/src/Symfony/Bridge/PhpUnit/TextUI/Command.php
+++ b/src/Symfony/Bridge/PhpUnit/TextUI/Command.php
@@ -13,7 +13,7 @@ namespace Symfony\Bridge\PhpUnit\TextUI;
 
 use PHPUnit\TextUI\Command as BaseCommand;
 
-if (class_exists('PHPUnit_TextUI_Command')) {
+if (class_exists('PHPUnit_Runner_Version') && version_compare(\PHPUnit_Runner_Version::id(), '6.0.0', '<')) {
     class_alias('Symfony\Bridge\PhpUnit\Legacy\Command', 'Symfony\Bridge\PhpUnit\TextUI\Command');
 
     return;
diff --git a/src/Symfony/Bridge/PhpUnit/TextUI/TestRunner.php b/src/Symfony/Bridge/PhpUnit/TextUI/TestRunner.php
index 2d18b4f9af..07fe2d165b 100644
--- a/src/Symfony/Bridge/PhpUnit/TextUI/TestRunner.php
+++ b/src/Symfony/Bridge/PhpUnit/TextUI/TestRunner.php
@@ -14,7 +14,7 @@ namespace Symfony\Bridge\PhpUnit\TextUI;
 use PHPUnit\TextUI\TestRunner as BaseRunner;
 use Symfony\Bridge\PhpUnit\SymfonyTestsListener;
 
-if (class_exists('PHPUnit_TextUI_Command')) {
+if (class_exists('PHPUnit_Runner_Version') && version_compare(\PHPUnit_Runner_Version::id(), '6.0.0', '<')) {
     class_alias('Symfony\Bridge\PhpUnit\Legacy\TestRunner', 'Symfony\Bridge\PhpUnit\TextUI\TestRunner');
 
     return;