diff --git a/dhub/settings.py b/dhub/settings.py
index c580e6b..891b714 100644
--- a/dhub/settings.py
+++ b/dhub/settings.py
@@ -36,7 +36,7 @@ assert DOMAIN not in [None, ''], "DOMAIN var is MANDATORY"
 print("DOMAIN: " + DOMAIN)
 
 ALLOWED_HOSTS = config('ALLOWED_HOSTS', default=DOMAIN, cast=Csv())
-assert DOMAIN in ALLOWED_HOSTS, f"DOMAIN ${DOMAIN} is not in ALLOWED_HOSTS ${ALLOWED_HOSTS}"
+assert DOMAIN in ALLOWED_HOSTS, f"DOMAIN {DOMAIN} is not in ALLOWED_HOSTS {ALLOWED_HOSTS}"
 
 CSRF_TRUSTED_ORIGINS = config('CSRF_TRUSTED_ORIGINS', default=f'https://{DOMAIN}', cast=Csv())