diff --git a/cloudron.js b/cloudron.js
index 7b212e4..b2f9908 100644
--- a/cloudron.js
+++ b/cloudron.js
@@ -32,7 +32,7 @@ function Cloudron(box) {
 }
 
 Cloudron.prototype._setDomain = function (domain) {
-    this._isCustomDomain = !domain.match(/.*\.cloudron\.(me|eu|de)$/);
+    this._isCustomDomain = domain === process.env.CUSTOM_DOMAIN || domain === process.env.SELFHOST_DOMAIN;
     this._adminFqdn = this._isCustomDomain ? 'my.' + domain : 'my-' + domain;
     this._origin = this._isCustomDomain ? 'https://my.' + domain : 'https://my-' + domain;
 };