diff --git a/mandelstudio/templatetags/mandelstudio_i18n.py b/mandelstudio/templatetags/mandelstudio_i18n.py
index dabfd29..17e44f2 100644
--- a/mandelstudio/templatetags/mandelstudio_i18n.py
+++ b/mandelstudio/templatetags/mandelstudio_i18n.py
@@ -41,7 +41,9 @@ def language_neutral_path(value: str | None) -> str:
     language_codes = [code for code, _ in settings.LANGUAGES]
     if language_codes:
         # Strip the first language segment, e.g. /en/manage -> /manage.
-        pattern = rf"^/(?:{'|'.join(re.escape(code) for code in language_codes)})(?=/|$)"
+        pattern = (
+            rf"^/(?:{'|'.join(re.escape(code) for code in language_codes)})(?=/|$)"
+        )
         path = re.sub(pattern, "", path, count=1) or "/"
 
     return urlunsplit(("", "", path, parsed.query, ""))
diff --git a/mandelstudio/tests/test_mandelstudio_i18n_templatetags.py b/mandelstudio/tests/test_mandelstudio_i18n_templatetags.py
index f430489..384c0eb 100644
--- a/mandelstudio/tests/test_mandelstudio_i18n_templatetags.py
+++ b/mandelstudio/tests/test_mandelstudio_i18n_templatetags.py
@@ -18,14 +18,22 @@ from mandelstudio.templatetags.mandelstudio_i18n import language_neutral_path
 class LanguageNeutralPathFilterTests(SimpleTestCase):
     def test_strips_language_prefix(self):
         self.assertEqual(language_neutral_path("/en/manage/"), "/manage/")
-        self.assertEqual(language_neutral_path("/fr/manage/checkout/paymentmethod/"), "/manage/checkout/paymentmethod/")
+        self.assertEqual(
+            language_neutral_path("/fr/manage/checkout/paymentmethod/"),
+            "/manage/checkout/paymentmethod/",
+        )
 
     def test_keeps_unprefixed_path(self):
         self.assertEqual(language_neutral_path("/manage/"), "/manage/")
-        self.assertEqual(language_neutral_path("/manage/checkout/paymentmethod/"), "/manage/checkout/paymentmethod/")
+        self.assertEqual(
+            language_neutral_path("/manage/checkout/paymentmethod/"),
+            "/manage/checkout/paymentmethod/",
+        )
 
     def test_preserves_query_string(self):
         self.assertEqual(
-            language_neutral_path("/de/manage/?next=/de/manage/checkout/paymentmethod/"),
+            language_neutral_path(
+                "/de/manage/?next=/de/manage/checkout/paymentmethod/"
+            ),
             "/manage/?next=/de/manage/checkout/paymentmethod/",
         )