diff --git a/composer.json b/composer.json
index 4e05e0c9..e7b1b147 100644
--- a/composer.json
+++ b/composer.json
@@ -41,9 +41,9 @@
         ]
     },
     "autoload": {
-        "psr-4": {
-            "": "src/"
-        },
+        "classmap": [
+            "src/"
+        ],
         "files": [
             "export-command.php"
         ]