diff --git a/core/lib/Drupal/Component/Attribute/composer.json b/core/lib/Drupal/Component/Attribute/composer.json
index 313e13b..80dcdf4 100644
--- a/core/lib/Drupal/Component/Attribute/composer.json
+++ b/core/lib/Drupal/Component/Attribute/composer.json
@@ -10,7 +10,7 @@
         "drupal/core-utility": "~8.1"
     },
     "autoload": {
-        "psr-0": {
+        "psr-4": {
             "Drupal\\Component\\Attribute\\": ""
         }
     }