diff --git a/manifests/init.pp b/manifests/init.pp
index 1807b34..3b482a5 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -239,7 +239,7 @@ class mastodon (
     timeout     => 0,
     require     => File['/usr/local/bin/install_mastodon.sh'],
   }
-  $real_config = $mastodon_config + {
+  $built_config = {
     LOCAL_DOMAIN    => $hostname,
     DB_PASS         => $db_password,
     DB_USER         => $db_user,
@@ -249,6 +249,7 @@ class mastodon (
     SECRET_KEY_BASE => $secret_key_base,
     OTP_SECRET      => $otp_secret,
   }
+  $real_config = $mastodon_config + $built_config
   file { "${mastodon_home}/live/.env.production":
     ensure  => $ensure,
     content => template('mastodon/env.production.erb'),