diff --git a/src/Discovery/ComposerJson.php b/src/Discovery/ComposerJson.php
index 6e4e85a..10dde34 100644
--- a/src/Discovery/ComposerJson.php
+++ b/src/Discovery/ComposerJson.php
@@ -85,7 +85,7 @@ class ComposerJson {
 
     if (!empty($data['autoload']['files'])) {
       foreach ($data['autoload']['files'] as $file) {
-        require $this->pathPrefix . $file;
+        require_once $this->pathPrefix . $file;
       }
     }
   }
