1 files changed, 6 insertions, 6 deletions
diff --git a/oauthlib/oauth2/rfc6749/parameters.py b/oauthlib/oauth2/rfc6749/parameters.py
index 14d4c0d..b6249d8 100644
--- a/oauthlib/oauth2/rfc6749/parameters.py
+++ b/oauthlib/oauth2/rfc6749/parameters.py
@@ -13,7 +13,7 @@ import json
 import os
 import time
 
-from oauthlib.common import add_params_to_qs, add_params_to_uri, unicode_type
+from oauthlib.common import add_params_to_qs, add_params_to_uri
 from oauthlib.signals import scope_changed
 
 from .errors import (InsecureTransportError, MismatchingStateError,
@@ -82,7 +82,7 @@ def prepare_grant_uri(uri, client_id, response_type, redirect_uri=None,
 
     for k in kwargs:
         if kwargs[k]:
-            params.append((unicode_type(k), kwargs[k]))
+            params.append((str(k), kwargs[k]))
 
     return add_params_to_uri(uri, params)
 
@@ -146,18 +146,18 @@ def prepare_token_request(grant_type, body='', include_client_id=True, **kwargs)
     client_id = kwargs.pop('client_id', None)
     if include_client_id:
         if client_id is not None:
-            params.append((unicode_type('client_id'), client_id))
+            params.append((str('client_id'), client_id))
 
     # the kwargs iteration below only supports including boolean truth (truthy)
     # values, but some servers may require an empty string for `client_secret`
     client_secret = kwargs.pop('client_secret', None)
     if client_secret is not None:
-        params.append((unicode_type('client_secret'), client_secret))
+        params.append((str('client_secret'), client_secret))
 
     # this handles: `code`, `redirect_uri`, and other undocumented params
     for k in kwargs:
         if kwargs[k]:
-            params.append((unicode_type(k), kwargs[k]))
+            params.append((str(k), kwargs[k]))
 
     return add_params_to_qs(body, params)
 
@@ -209,7 +209,7 @@ def prepare_token_revocation_request(url, token, token_type_hint="access_token",
 
     for k in kwargs:
         if kwargs[k]:
-            params.append((unicode_type(k), kwargs[k]))
+            params.append((str(k), kwargs[k]))
 
     headers = {'Content-Type': 'application/x-www-form-urlencoded'}