diff --git a/nixos/modules/services/mail/postfixadmin.nix b/nixos/modules/services/mail/postfixadmin.nix
index 739141f614ce..0f453d24e52f 100644
--- a/nixos/modules/services/mail/postfixadmin.nix
+++ b/nixos/modules/services/mail/postfixadmin.nix
@@ -159,7 +159,7 @@ in
         set -euo pipefail
 
         PSQL() {
-            psql --port=${toString pgsql.port} "$@"
+            psql --port=${toString pgsql.settings.port} "$@"
         }
 
         PSQL -tAc "SELECT 1 FROM pg_database WHERE datname = '${cfg.database.dbname}'" | grep -q 1 || PSQL -tAc 'CREATE DATABASE "${cfg.database.dbname}" OWNER "${cfg.database.username}"'