diff --git a/composer.json b/composer.json
index a819026..74bbcdf 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
       "php": ">=5.3.0"
    },
    "autoload": {
-      "files": ["AltoRouter.php"]
+      "classmap": ["AltoRouter.php"]
    },
    "license" : "MIT"
 }