diff --git a/setup.php b/setup.php
index 8e9cd0f..f1b614b 100644
--- a/setup.php
+++ b/setup.php
@@ -51,7 +51,9 @@ function plugin_init_butterfly()
       }
       ;
 
-      Plugin::registerClass('\GlpiPlugin\Butterfly\Config', [
+      // Sem barra invertida inicial: isPluginItemType() rejeita '\GlpiPlugin\...'
+      // e registerClass retornaria false silenciosamente (::class nunca tem o \)
+      Plugin::registerClass(\GlpiPlugin\Butterfly\Config::class, [
          'addtabon' => ['Config']
       ]);