diff --git a/src/User/UserProvider.php b/src/User/UserProvider.php
index 7b9366c8..07c34a04 100644
--- a/src/User/UserProvider.php
+++ b/src/User/UserProvider.php
@@ -60,7 +60,7 @@ public function __invoke(): ?AuditorUserInterface
             return null;
         }
 
-        return new User($identifier, $username);
+        return new User((string) $identifier, $username);
     }
 
     private function getTokenUser(): ?UserInterface