diff --git a/configuration/configuration.py b/configuration/configuration.py
index 8d19fd9..db35c1b 100644
--- a/configuration/configuration.py
+++ b/configuration/configuration.py
@@ -58,6 +58,9 @@ _BASE_DIR = dirname(dirname(abspath(__file__)))
 #
 # Example: ALLOWED_HOSTS = ['netbox.example.com', 'netbox.internal.local']
 ALLOWED_HOSTS = environ.get('ALLOWED_HOSTS', '*').split(' ')
+# ensure that '*' or 'localhost' is always in ALLOWED_HOSTS
+if '*' not in ALLOWED_HOSTS and 'localhost' not in ALLOWED_HOSTS:
+    ALLOWED_HOSTS.append('localhost')
 
 # PostgreSQL database configuration. See the Django documentation for a complete list of available parameters:
 #   https://docs.djangoproject.com/en/stable/ref/settings/#databases