diff --git a/warrant/__init__.py b/warrant/__init__.py
index 2a0c2313..cfe197be 100644
--- a/warrant/__init__.py
+++ b/warrant/__init__.py
@@ -551,7 +551,7 @@ def renew_access_token(self):
         self._add_secret_hash(auth_params, 'SECRET_HASH')
         refresh_response = self.client.initiate_auth(
             ClientId=self.client_id,
-            AuthFlow='REFRESH_TOKEN',
+            AuthFlow='REFRESH_TOKEN_AUTH',
             AuthParameters=auth_params,
         )