diff --git a/dulwich/contrib/paramiko_vendor.py b/dulwich/contrib/paramiko_vendor.py
index db5c6386..541d99b5 100644
--- a/dulwich/contrib/paramiko_vendor.py
+++ b/dulwich/contrib/paramiko_vendor.py
@@ -1,117 +1,117 @@
 # paramiko_vendor.py -- paramiko implementation of the SSHVendor interface
 # Copyright (C) 2013 Aaron O'Mullan <aaron.omullan@friendco.de>
 #
 # Dulwich is dual-licensed under the Apache License, Version 2.0 and the GNU
 # General Public License as public by the Free Software Foundation; version 2.0
 # or (at your option) any later version. You can redistribute it and/or
 # modify it under the terms of either of these two licenses.
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 # You should have received a copy of the licenses; if not, see
 # <http://www.gnu.org/licenses/> for a copy of the GNU General Public License
 # and <http://www.apache.org/licenses/LICENSE-2.0> for a copy of the Apache
 # License, Version 2.0.
 #
 
 """Paramiko SSH support for Dulwich.
 
 To use this implementation as the SSH implementation in Dulwich, override
 the dulwich.client.get_ssh_vendor attribute:
 
   >>> from dulwich import client as _mod_client
   >>> from dulwich.contrib.paramiko_vendor import ParamikoSSHVendor
   >>> _mod_client.get_ssh_vendor = ParamikoSSHVendor
 
 This implementation is experimental and does not have any tests.
 """
 
 import paramiko
 import paramiko.client
 
 
 class _ParamikoWrapper(object):
     def __init__(self, client, channel):
         self.client = client
         self.channel = channel
 
         # Channel must block
         self.channel.setblocking(True)
 
     @property
     def stderr(self):
-        return self.channel.makefile_stderr(mode='rb')
+        return self.channel.makefile_stderr('rb')
 
     def can_read(self):
         return self.channel.recv_ready()
 
     def write(self, data):
         return self.channel.sendall(data)
 
     def read(self, n=None):
         data = self.channel.recv(n)
         data_len = len(data)
 
         # Closed socket
         if not data:
             return b""
 
         # Read more if needed
         if n and data_len < n:
             diff_len = n - data_len
             return data + self.read(diff_len)
         return data
 
     def close(self):
         self.channel.close()
 
 
 class ParamikoSSHVendor(object):
     # http://docs.paramiko.org/en/2.4/api/client.html
 
     def __init__(self, **kwargs):
         self.kwargs = kwargs
 
     def run_command(
         self,
         host,
         command,
         username=None,
         port=None,
         password=None,
         pkey=None,
         key_filename=None,
         **kwargs
     ):
 
         client = paramiko.SSHClient()
 
         connection_kwargs = {"hostname": host}
         connection_kwargs.update(self.kwargs)
         if username:
             connection_kwargs["username"] = username
         if port:
             connection_kwargs["port"] = port
         if password:
             connection_kwargs["password"] = password
         if pkey:
             connection_kwargs["pkey"] = pkey
         if key_filename:
             connection_kwargs["key_filename"] = key_filename
         connection_kwargs.update(kwargs)
 
         policy = paramiko.client.MissingHostKeyPolicy()
         client.set_missing_host_key_policy(policy)
         client.connect(**connection_kwargs)
 
         # Open SSH session
         channel = client.get_transport().open_session()
 
         # Run commands
         channel.exec_command(command)
 
         return _ParamikoWrapper(client, channel)