diff --git a/src/briar/api/models/private_chat.py b/src/briar/api/models/private_chat.py
index abf5e3b6ccec64d055fe9d0347b239e606a504ee..13ff60d0b5667674e4be84f8be1ef9ae85f35c43 100644
--- a/src/briar/api/models/private_chat.py
+++ b/src/briar/api/models/private_chat.py
@@ -14,7 +14,7 @@ from briar.api.model import Model
 class PrivateChat(Model):
 
     def get(self, contact_id):
-        url = urljoin(BASE_HTTP_URL, 'messages/%i' % contact_id)
+        url = urljoin(BASE_HTTP_URL, "messages/%i" % contact_id)
         request = _get(url, headers=self._headers)
         return request.json()
 
@@ -24,5 +24,5 @@ class PrivateChat(Model):
                                         contact_id=contact_id)
 
     def send(self, contact_id, message):
-        url = urljoin(BASE_HTTP_URL, 'messages/%i' % contact_id)
-        _post(url, headers=self._headers, json={'text': message})
+        url = urljoin(BASE_HTTP_URL, "messages/%i" % contact_id)
+        _post(url, headers=self._headers, json={"text": message})
diff --git a/tests/briar/api/models/test_private_chat.py b/tests/briar/api/models/test_private_chat.py
index 46b908a0d273077f7105f4d907d5dd5d5283bcfd..5d071a888dc7347611cea96c054cfdbaaffcc09d 100644
--- a/tests/briar/api/models/test_private_chat.py
+++ b/tests/briar/api/models/test_private_chat.py
@@ -9,7 +9,8 @@ import requests_mock
 from briar.api.models.private_chat import PrivateChat
 
 
-@requests_mock.Mocker(kw='requests_mock')
+
+@requests_mock.Mocker(kw="requests_mock")
 def test_get_empty(api, request_headers, requests_mock):
     private_chat = PrivateChat(api)
     contact_id = 1