diff --git a/gregui/api/views/invitation.py b/gregui/api/views/invitation.py
index 9b0f58ad5bd9a77ec8d463d0685a641ef52751f0..2fd4485434a29cc01ceda0b9ee8337dd2f264b1c 100644
--- a/gregui/api/views/invitation.py
+++ b/gregui/api/views/invitation.py
@@ -78,7 +78,10 @@ class InvitationView(CreateAPIView, DestroyAPIView):
 
         # TODO Determine if person should be deleted as well
         if invitationlink:
-            if invitationlink.invitation.role.person.is_registered or invitationlink.invitation.role.person.is_verified:
+            if (
+                invitationlink.invitation.role.person.is_registered
+                or invitationlink.invitation.role.person.is_verified
+            ):
                 # The guest has already gone through the registration step. The guest should
                 # not be verified, but including that check just in case here
                 return Response(status.HTTP_400_BAD_REQUEST)
@@ -262,7 +265,7 @@ class InvitedGuestView(GenericAPIView):
 
     @staticmethod
     def _get_identity_or_none(
-            person: Person, identity_type: Identity.IdentityType
+        person: Person, identity_type: Identity.IdentityType
     ) -> Optional[str]:
         try:
             return person.identities.get(type=identity_type).value
diff --git a/gregui/tests/api/test_invite_guest.py b/gregui/tests/api/test_invite_guest.py
index 9e95b3693dc8b1aa22ca46c81035a35d902808b5..0f265b1e44311d0001c0d6e7f444f3c6305a1d42 100644
--- a/gregui/tests/api/test_invite_guest.py
+++ b/gregui/tests/api/test_invite_guest.py
@@ -16,10 +16,10 @@ def test_invite_guest(client, user_sponsor, unit_foo, role_type_foo):
         "email": "test@example.com",
         "role": {
             "start_date": (
-                    datetime.datetime.today() + datetime.timedelta(days=1)
+                datetime.datetime.today() + datetime.timedelta(days=1)
             ).strftime("%Y-%m-%d"),
             "end_date": (
-                    datetime.datetime.today() + datetime.timedelta(days=10)
+                datetime.datetime.today() + datetime.timedelta(days=10)
             ).strftime("%Y-%m-%d"),
             "orgunit": unit_foo.id,
             "type": role_type_foo.id,
@@ -52,7 +52,9 @@ def test_invite_guest(client, user_sponsor, unit_foo, role_type_foo):
 
 
 @pytest.mark.django_db
-def test_invite_cancel(client, invitation_link, invitation, role, log_in, sponsor_guy, user_sponsor):
+def test_invite_cancel(
+    client, invitation_link, invitation, role, log_in, sponsor_guy, user_sponsor
+):
     # TODO: Should all sponsors be allowed to delete arbitrary invitations?
     log_in(user_sponsor)
     url = reverse("gregui-v1:invitation")