diff --git a/composer.json b/composer.json
index e0cf535..633150d 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
         "php": ">=7.4"
     },
     "autoload": {
-        "classmap": [
+        "files": [
           "metagen.inc.php", 
           "parser.inc.php"
         ]