diff --git a/symfony/phpunit-bridge/3.3/bin/phpunit b/symfony/phpunit-bridge/3.3/bin/phpunit
index 75d5be85a..6baa2857e 100755
--- a/symfony/phpunit-bridge/3.3/bin/phpunit
+++ b/symfony/phpunit-bridge/3.3/bin/phpunit
@@ -5,6 +5,10 @@ if (!file_exists(dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-php
     echo "Unable to find the `simple-phpunit` script in `vendor/symfony/phpunit-bridge/bin/`.\n";
     exit(1);
 }
+if (false === getenv('SYMFONY_DEPRECATIONS_HELPER')) {
+    // see https://symfony.com/doc/current/components/phpunit_bridge.html#making-tests-fail
+    putenv('SYMFONY_DEPRECATIONS_HELPER=999999');
+}
 if (false === getenv('SYMFONY_PHPUNIT_REMOVE')) {
     putenv('SYMFONY_PHPUNIT_REMOVE=symfony/yaml');
 }
diff --git a/symfony/phpunit-bridge/4.1/bin/phpunit b/symfony/phpunit-bridge/4.1/bin/phpunit
index 5973cd322..79aa012e3 100755
--- a/symfony/phpunit-bridge/4.1/bin/phpunit
+++ b/symfony/phpunit-bridge/4.1/bin/phpunit
@@ -5,6 +5,10 @@ if (!file_exists(dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-php
     echo "Unable to find the `simple-phpunit` script in `vendor/symfony/phpunit-bridge/bin/`.\n";
     exit(1);
 }
+if (false === getenv('SYMFONY_DEPRECATIONS_HELPER')) {
+    // see https://symfony.com/doc/current/components/phpunit_bridge.html#making-tests-fail
+    putenv('SYMFONY_DEPRECATIONS_HELPER=999999');
+}
 if (false === getenv('SYMFONY_PHPUNIT_REMOVE')) {
     putenv('SYMFONY_PHPUNIT_REMOVE=');
 }