diff --git a/composer.json b/composer.json
index 01db0ee..b6f226f 100644
--- a/composer.json
+++ b/composer.json
@@ -14,8 +14,8 @@
         "php": "4 - 5"
     },
     "autoload": {
-        "psr-4": {
-            "monperrus\\bibtexbrowser\\": "./"
-        }
+        "classmap": [
+            "bibtexbrowser.php"
+        ]
     }
 }