diff --git a/script/cache_critical_dns b/script/cache_critical_dns
index 96099bb55bf..a4350aed5c3 100755
--- a/script/cache_critical_dns
+++ b/script/cache_critical_dns
@@ -174,13 +174,13 @@ HEALTH_CHECKS = {
   "DISCOURSE_DB_HOST": lambda { |addr|
     postgres_healthcheck(
       host: addr,
-      user: ENV["DISCOURSE_DB_USER_NAME"] || DEFAULT_DB_NAME,
+      user: ENV["DISCOURSE_DB_USERNAME"] || DEFAULT_DB_NAME,
       dbname: ENV["DISCOURSE_DB_NAME"] || DEFAULT_DB_NAME,
       password: ENV["DISCOURSE_DB_PASSWORD"])},
   "DISCOURSE_DB_REPLICA_HOST": lambda { |addr|
     postgres_healthcheck(
       host: addr,
-      user: ENV["DISCOURSE_DB_USER_NAME"] || DEFAULT_DB_NAME,
+      user: ENV["DISCOURSE_DB_USERNAME"] || DEFAULT_DB_NAME,
       dbname: ENV["DISCOURSE_DB_NAME"] || DEFAULT_DB_NAME,
       password: ENV["DISCOURSE_DB_PASSWORD"])},
   "DISCOURSE_REDIS_HOST": lambda { |addr|