diff --git a/composer.json b/composer.json
index 06d92e0..762e205 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,9 @@
         "source": "https://github.com/RobThree/TwoFactorAuth"
     },
     "autoload": {
-        "psr-0": { "RobThree\\TwoFactorAuth\\": "lib/" }
+        "classmap": [
+            "lib/"
+        ]
     },
     "require": {
         "php": ">=5.3.0"