diff --git a/src/Symfony/Contracts/composer.json b/src/Symfony/Contracts/composer.json
index b233c3da13..36d5c7678a 100644
--- a/src/Symfony/Contracts/composer.json
+++ b/src/Symfony/Contracts/composer.json
@@ -41,7 +41,7 @@
     },
     "autoload": {
         "psr-4": { "Symfony\\Contracts\\": "" },
-        "file": [ "Deprecation/deprecated.php" ],
+        "files": [ "Deprecation/deprecated.php" ],
         "exclude-from-classmap": [
             "**/Tests/"
         ]