diff --git a/composer.json b/composer.json
index 69f3b18..c07a4d1 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,8 @@
         "classmap": [ "app/AppKernel.php", "app/AppCache.php" ]
     },
     "autoload-dev": {
-        "psr-4": { "Tests\\": "tests/" }
+        "psr-4": { "Tests\\": "tests/" },
+        "files": [ "vendor/symfony/symfony/src/Symfony/Component/VarDumper/Resources/functions/dump.php" ]
     },
     "require": {
         "php": ">=7.1.0",