diff --git a/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit b/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit
index 7b5e3b1675a7..9f933d4f2450 100755
--- a/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit
+++ b/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit
@@ -175,7 +175,7 @@ if (class_exists('PHPUnit_Util_Blacklist')) {
     eval(" // PHP 5.3 compat
     (new PHPUnit\Util\BlackList())->getBlacklistedDirectories();
     PHPUnit\Util\Blacklist::addDirectory(dirname((new ReflectionClass('SymfonyBlacklistPhpunit'))->getFileName()));
-    PHPUnit\Util\Blacklist::addDirectory(dirname((new ReflectionClass('SymfonyBlacklistSimplePhpunit'))->getFileName()));
+    class_exists('SymfonyBlacklistSimplePhpunit', false) && PHPUnit\Util\Blacklist::addDirectory(dirname((new ReflectionClass('SymfonyBlacklistSimplePhpunit'))->getFileName()));
     ");
 } else {
     PHPUnit\Util\Blacklist::$blacklistedClassNames['SymfonyBlacklistPhpunit'] = 1;