diff --git a/src/Grant/RefreshTokenGrant.php b/src/Grant/RefreshTokenGrant.php
index 10ebcad5..566fac91 100644
--- a/src/Grant/RefreshTokenGrant.php
+++ b/src/Grant/RefreshTokenGrant.php
@@ -96,7 +96,7 @@ class RefreshTokenGrant extends AbstractGrant
     {
         $encryptedRefreshToken = $this->getRequestParameter('refresh_token', $request);
         if (is_null($encryptedRefreshToken)) {
-            throw OAuthServerException::invalidRequest('refresh_token', '`%s` parameter is missing');
+            throw OAuthServerException::invalidRequest('refresh_token');
         }
 
         // Validate refresh token