diff --git a/composer.json b/composer.json
index 1f39f31..94f16c6 100644
--- a/composer.json
+++ b/composer.json
@@ -6,6 +6,6 @@
         "php": ">=7.4"
     },
     "autoload": {
-        "classmap": ["slack.inc.php"]
+        "files": ["slack.inc.php"]
     }
 }