diff --git a/src/Grant/PasswordGrant.php b/src/Grant/PasswordGrant.php
index 351954b4..50593ef3 100644
--- a/src/Grant/PasswordGrant.php
+++ b/src/Grant/PasswordGrant.php
@@ -64,7 +64,7 @@ class PasswordGrant extends AbstractGrant
         // Validate request
         $client = $this->validateClient($request);
         $user   = $this->validateUser($request);
-        $scopes = $this->validateScopes($request, $scopeDelimiter, $client);
+        $scopes = $this->validateScopes($request, $client);
 
         // Issue and persist new tokens
         $accessToken = $this->issueAccessToken($tokenTTL, $client, $user->getIdentifier(), $scopes);