diff --git a/src/Grant/ClientCredentialsGrant.php b/src/Grant/ClientCredentialsGrant.php
index 05f6a917..a52b9385 100644
--- a/src/Grant/ClientCredentialsGrant.php
+++ b/src/Grant/ClientCredentialsGrant.php
@@ -11,8 +11,6 @@
 
 namespace League\OAuth2\Server\Grant;
 
-use League\OAuth2\Server\Entities\Interfaces\ClientEntityInterface;
-use League\OAuth2\Server\Exception\OAuthServerException;
 use League\OAuth2\Server\ResponseTypes\ResponseTypeInterface;
 use Psr\Http\Message\ServerRequestInterface;
 
diff --git a/src/Grant/RefreshTokenGrant.php b/src/Grant/RefreshTokenGrant.php
index 21fe4f39..b84c24c7 100644
--- a/src/Grant/RefreshTokenGrant.php
+++ b/src/Grant/RefreshTokenGrant.php
@@ -125,7 +125,7 @@ class RefreshTokenGrant extends AbstractGrant
             throw OAuthServerException::invalidRefreshToken(
                 'Token is not linked to client,' .
                 ' got: ' . $clientId .
-                ' expected: '. $refreshTokenData['client_id']
+                ' expected: ' . $refreshTokenData['client_id']
             );
         }