diff --git a/scoper.inc.php b/scoper.inc.php
index f1673c71..547a4948 100644
--- a/scoper.inc.php
+++ b/scoper.inc.php
@@ -15,7 +15,6 @@
 use Isolated\Symfony\Component\Finder\Finder;
 
 return [
-    'prefix' => 'Foo',
     'whitelist' => [
         Finder::class,
     ],