diff --git a/provider/views.py b/provider/views.py
index dd1200df..161e5721 100644
--- a/provider/views.py
+++ b/provider/views.py
@@ -292,13 +292,13 @@ class Redirect(OAuthView, Mixin):
     an error.
     """
 
-    def error_response(self, error, mimetype='application/json', status=400,
+    def error_response(self, error, content_type='application/json', status=400,
             **kwargs):
         """
         Return an error response to the client with default status code of
         *400* stating the error as outlined in :rfc:`5.2`.
         """
-        return HttpResponse(json.dumps(error), mimetype=mimetype,
+        return HttpResponse(json.dumps(error), content_type=content_type,
                 status=status, **kwargs)
 
     def get(self, request):
@@ -457,13 +457,13 @@ def invalidate_access_token(self, access_token):
         """
         raise NotImplementedError
 
-    def error_response(self, error, mimetype='application/json', status=400,
+    def error_response(self, error, content_type='application/json', status=400,
             **kwargs):
         """
         Return an error response to the client with default status code of
         *400* stating the error as outlined in :rfc:`5.2`.
         """
-        return HttpResponse(json.dumps(error), mimetype=mimetype,
+        return HttpResponse(json.dumps(error), content_type=content_type,
                 status=status, **kwargs)
 
     def access_token_response(self, access_token):
@@ -488,7 +488,7 @@ def access_token_response(self, access_token):
             pass
 
         return HttpResponse(
-            json.dumps(response_data), mimetype='application/json'
+            json.dumps(response_data), content_type='application/json'
         )
 
     def authorization_code(self, request, data, client):