diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index a8d30e8e164fc..fa06c0eaddde8 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -205,7 +205,7 @@ public function load(array $configs, ContainerBuilder $container)
                     ->addError('You cannot use the "slugger" service since the Translation contracts are not installed. Try running "composer require symfony/translation".');
             }
 
-            if (!\extension_loaded('intl')) {
+            if (!\extension_loaded('intl') && !\defined('PHPUNIT_COMPOSER_INSTALL')) {
                 @trigger_error('Please install the "intl" PHP extension for best performance.', E_USER_DEPRECATED);
             }
         }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/SluggerLocaleAwareTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/SluggerLocaleAwareTest.php
index 311b3ed5ec974..d8552977c0835 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/SluggerLocaleAwareTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/SluggerLocaleAwareTest.php
@@ -16,6 +16,9 @@
  */
 class SluggerLocaleAwareTest extends AbstractWebTestCase
 {
+    /**
+     * @requires extension intl
+     */
     public function testLocalizedSlugger()
     {
         $kernel = static::createKernel(['test_case' => 'Slugger', 'root_config' => 'config.yml']);