diff --git a/ihatemoney/api/common.py b/ihatemoney/api/common.py
index c33ee70c..fa097dec 100644
--- a/ihatemoney/api/common.py
+++ b/ihatemoney/api/common.py
@@ -35,7 +35,9 @@ def need_auth(f):
                 auth_token = auth_header.split(" ")[1]
             except IndexError:
                 abort(401)
-            project_id = Project.verify_token(auth_token, token_type="auth", project_id=project_id)
+            project_id = Project.verify_token(
+                auth_token, token_type="auth", project_id=project_id
+            )
             if auth_token and project_id:
                 project = Project.query.get(project_id)
                 if project:
diff --git a/ihatemoney/models.py b/ihatemoney/models.py
index ddf9b714..2a4cf3a4 100644
--- a/ihatemoney/models.py
+++ b/ihatemoney/models.py
@@ -367,7 +367,8 @@ class Project(db.Model):
         :param token: Serialized TimedJsonWebToken
         :param token_type: Either "auth" for authentication (invalidated when project code changed),
                         or "reset" for password reset (invalidated after expiration)
-        :param project_id: Project ID. Used for token_type "auth" to use the password as serializer secret key.
+        :param project_id: Project ID. Used for token_type "auth" to use the password as serializer
+                        secret key.
         :param max_age: Token expiration time (in seconds). Only used with token_type "reset"
         """
         loads_kwargs = {}
@@ -378,7 +379,7 @@ class Project(db.Model):
             loads_kwargs["max_age"] = max_age
         else:
             project = Project.query.get(project_id)
-            password = project.password if project is not None else ''
+            password = project.password if project is not None else ""
             serializer = URLSafeSerializer(
                 current_app.config["SECRET_KEY"] + password, salt=token_type
             )
@@ -390,7 +391,9 @@ class Project(db.Model):
             return None
 
         data_project = data.get("project_id")
-        return data_project if project_id is None or data_project == project_id else None
+        return (
+            data_project if project_id is None or data_project == project_id else None
+        )
 
     def __str__(self):
         return self.name
diff --git a/ihatemoney/tests/api_test.py b/ihatemoney/tests/api_test.py
index 0894b15b..83d5aa2a 100644
--- a/ihatemoney/tests/api_test.py
+++ b/ihatemoney/tests/api_test.py
@@ -213,7 +213,9 @@ class APITestCase(IhatemoneyTestCase):
             "/api/projects/raclette/token", headers=self.get_auth("raclette")
         )
         decoded_resp = json.loads(resp.data.decode("utf-8"))
-        resp = self.client.get(f"/authenticate?token={decoded_resp['token']}&project_id=raclette")
+        resp = self.client.get(
+            f"/authenticate?token={decoded_resp['token']}&project_id=raclette"
+        )
         # Test that we are redirected.
         self.assertEqual(302, resp.status_code)
 
diff --git a/ihatemoney/web.py b/ihatemoney/web.py
index 0f75d640..47df3f49 100644
--- a/ihatemoney/web.py
+++ b/ihatemoney/web.py
@@ -206,7 +206,9 @@ def authenticate(project_id=None):
     # Try to get project_id from token first
     token = request.args.get("token")
     if token:
-        project_id = Project.verify_token(token, token_type="auth", project_id=project_id)
+        project_id = Project.verify_token(
+            token, token_type="auth", project_id=project_id
+        )
         token_auth = True
     else:
         token_auth = False