diff --git a/app/dashboard/views/domain_detail.py b/app/dashboard/views/domain_detail.py
index f1327650..09f5c604 100644
--- a/app/dashboard/views/domain_detail.py
+++ b/app/dashboard/views/domain_detail.py
@@ -161,7 +161,9 @@ def domain_detail(custom_domain_id):
                 url_for("dashboard.domain_detail", custom_domain_id=custom_domain.id)
             )
         elif request.form.get("form-name") == "switch-random-prefix-generation":
-            custom_domain.random_prefix_generation = not custom_domain.random_prefix_generation
+            custom_domain.random_prefix_generation = (
+                not custom_domain.random_prefix_generation
+            )
             db.session.commit()
 
             if custom_domain.random_prefix_generation:
diff --git a/app/models.py b/app/models.py
index 242cea88..855276b2 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1450,7 +1450,9 @@ class CustomDomain(db.Model, ModelMixin):
     catch_all = db.Column(db.Boolean, nullable=False, default=False, server_default="0")
 
     # option to generate random prefix version automatically
-    random_prefix_generation = db.Column(db.Boolean, nullable=False, default=False, server_default="0")
+    random_prefix_generation = db.Column(
+        db.Boolean, nullable=False, default=False, server_default="0"
+    )
 
     user = db.relationship(User, foreign_keys=[user_id])