diff --git a/rai_core_flask/rai_core_flask/environments/azure_nb_environment.py b/rai_core_flask/rai_core_flask/environments/azure_nb_environment.py
index 9f710ababc..d2d4ecfab4 100644
--- a/rai_core_flask/rai_core_flask/environments/azure_nb_environment.py
+++ b/rai_core_flask/rai_core_flask/environments/azure_nb_environment.py
@@ -37,9 +37,11 @@ def __init__(self, service):
                 instance_name = self.nbvm["instance"]
                 domain_suffix = self.nbvm["domainsuffix"]
                 if service.is_private_link:
-                    url_format = f"{instance_name}.{domain_suffix}:{service.port}"
+                    url_format = f"{instance_name}.{domain_suffix}\
+                        :{service.port}"
                 else:
-                    url_format = f"{instance_name}-{service.port}.{domain_suffix}"
+                    url_format = f"{instance_name}-{service.port}\
+                        .{domain_suffix}"
                 self.base_url = \
                     f"https://{url_format}"
                 self.successfully_detected = True