diff --git a/gregui/api/serializers/guest.py b/gregui/api/serializers/guest.py
index d38b30a8a07f2527a959cbbd9e5b46f0b03d198a..80f122306623420c4c140cca14f0398f7eef4318 100644
--- a/gregui/api/serializers/guest.py
+++ b/gregui/api/serializers/guest.py
@@ -22,7 +22,9 @@ class GuestRegisterSerializer(serializers.ModelSerializer):
     first_name = serializers.CharField(required=False)
     last_name = serializers.CharField(required=False)
     email = serializers.CharField(required=True)
-    mobile_phone = serializers.CharField(required=True, validators=[_validatePhoneNumber])
+    mobile_phone = serializers.CharField(
+        required=True, validators=[_validatePhoneNumber]
+    )
     fnr = serializers.CharField(
         required=False, validators=[_validateNorwegianNationalIdNumber]
     )
diff --git a/gregui/tests/api/test_invitation.py b/gregui/tests/api/test_invitation.py
index 356a198d130f9bd06a56c7bad4397a95fcdbd0c2..d4ed39df02c61c0bd2eacdaf173c650f5c485e67 100644
--- a/gregui/tests/api/test_invitation.py
+++ b/gregui/tests/api/test_invitation.py
@@ -44,7 +44,7 @@ def test_get_invited_info_no_session(client, invitation_link):
 
 @pytest.mark.django_db
 def test_get_invited_info_session_okay(
-        client, invitation_link, person_foo_data, sponsor_guy_data, role_type_foo, unit_foo
+    client, invitation_link, person_foo_data, sponsor_guy_data, role_type_foo, unit_foo
 ):
     # get a session
     client.get(
@@ -78,7 +78,7 @@ def test_get_invited_info_session_okay(
 
 @pytest.mark.django_db
 def test_get_invited_info_expired_link(
-        client, invitation_link, invitation_expired_date
+    client, invitation_link, invitation_expired_date
 ):
     # Get a session while link is valid
     client.get(
@@ -96,7 +96,7 @@ def test_get_invited_info_expired_link(
 
 @pytest.mark.django_db
 def test_invited_guest_can_post_information(
-        client: APIClient, invitation_link, person_foo_data
+    client: APIClient, invitation_link, person_foo_data
 ):
     # get a session
     client.get(
@@ -125,7 +125,7 @@ def test_invited_guest_can_post_information(
 
 @pytest.mark.django_db
 def test_post_invited_info_expired_session(
-        client, invitation_link, invitation_expired_date
+    client, invitation_link, invitation_expired_date
 ):
     # get a session
     client.get(
@@ -158,7 +158,7 @@ def test_post_invited_info_deleted_inv_link(client, invitation_link):
 
 @pytest.mark.django_db
 def test_post_invited_info_invalid_national_id_number(
-        client, invitation_link, person_foo_data, person
+    client, invitation_link, person_foo_data, person
 ):
     data = {"mobile_phone": "+4707543001", "email": "test@example.com", "fnr": "123"}
     url = reverse("gregui-v1:invited-info")
@@ -179,7 +179,7 @@ def test_post_invited_info_invalid_national_id_number(
 
 @pytest.mark.django_db
 def test_post_invited_info_valid_national_id_number(
-        client, invitation_link, person_foo_data, person
+    client, invitation_link, person_foo_data, person
 ):
     fnr = "11120618212"
     data = {"mobile_phone": "+4797543992", "email": "test@example.com", "fnr": fnr}