diff --git a/bootstrap.php b/bootstrap.php
index d4dda6d..57fe576 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -4,13 +4,21 @@
  */
 
 call_user_func(function () {
-    $file = __DIR__ . '/vendor/autoload.php';
+    if (is_dir(__DIR__ . '/../../../vendor')) {
+        // Used as a composer library
+        $vendorDir = __DIR__ . '/../../../vendor';
+    } else {
+        $vendorDir = __DIR__ . '/vendor';
+    }
+
+    $file = $vendorDir . '/autoload.php';
     if (!is_file($file)) {
         echo 'You must set up the project dependencies, run the following commands:'.PHP_EOL.
             'curl -sS https://getcomposer.org/installer | php'.PHP_EOL.
             'php composer.phar install'.PHP_EOL;
         exit(1);
     }
+
     require $file;
 });