diff --git a/composer.json b/composer.json
index 7724e3f2..b306ad4d 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
 		"PHP" : ">=5.3"
 	},
 	"autoload": {
-		"psr-0": { "Less": "lib/" },
+		"psr-4": { "Less\\": "lib/Less/" },
 		"classmap": ["lessc.inc.php"]
 	},
 	"bin": [