diff --git a/controller/action/AcquisitionActions.class.php b/controller/action/AcquisitionActions.class.php
index f4c66438..422be407 100644
--- a/controller/action/AcquisitionActions.class.php
+++ b/controller/action/AcquisitionActions.class.php
@@ -45,7 +45,7 @@ class AcquisitionActions extends Actions
     return ['acquisition/yt2', ['_no_layout' => true]];
   }
 
-  public static function executeVerify(string $token = '')
+  public static function executeVerify(string $token)
   {
     return ['acquisition/verify', ['token' => $token]];
   }