diff --git a/composer.json b/composer.json
index 0cac1497..bd1bfdd6 100644
--- a/composer.json
+++ b/composer.json
@@ -38,9 +38,9 @@
         ]
     },
     "autoload": {
-        "psr-4": {
-            "": "src/"
-        },
+        "classmap": [
+            "src/"
+        ],
         "files": [
             "import-command.php"
         ]