diff --git a/src/Command/DeleteUserCommand.php b/src/Command/DeleteUserCommand.php
index 6a8987f56..4185debad 100644
--- a/src/Command/DeleteUserCommand.php
+++ b/src/Command/DeleteUserCommand.php
@@ -100,7 +100,7 @@ protected function interact(InputInterface $input, OutputInterface $output)
             '',
         ]);
 
-        $username = $this->io->ask('Username', null, [$this, 'usernameValidator']);
+        $username = $this->io->ask('Username', null, [$this->validator, 'validateUsername']);
         $input->setArgument('username', $username);
     }