diff --git a/composer.json b/composer.json
index edf38d5..0d768b3 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,10 @@
     "license": "MIT",
     "description": "Fast hydratation for read only purpose",
     "autoload": {
-        "psr-4": { "steevanb\\DoctrineReadOnlyHydrator\\": "" }
+        "psr-4": { "steevanb\\DoctrineReadOnlyHydrator\\": "" },
+        "exclude-from-classmap": [
+            "/ComposerOverloadClass/"
+        ]
     },
     "require": {
         "php" : "^5.4.6 || ^7.0",