diff --git a/flask_oauthlib/provider/oauth2.py b/flask_oauthlib/provider/oauth2.py
index d182f6ea..2bb84e79 100644
--- a/flask_oauthlib/provider/oauth2.py
+++ b/flask_oauthlib/provider/oauth2.py
@@ -949,7 +949,7 @@ def validate_scopes(self, client_id, scopes, client, request,
                         *args, **kwargs):
         """Ensure the client is authorized access to requested scopes."""
         if hasattr(client, 'validate_scopes'):
-            return client.validate_scopes(scopes)
+            return client.validate_scopes(scopes, request, *args, **kwargs)
         return set(client.default_scopes).issuperset(set(scopes))
 
     def validate_user(self, username, password, client, request,