diff --git a/lib/env.js b/lib/env.js
index 2c7f18c1a..0388aba03 100644
--- a/lib/env.js
+++ b/lib/env.js
@@ -98,7 +98,7 @@ module.exports.create = function (config) {
 
         protocol: new URL(httpUnsafeOrigin).protocol,
 
-        fileHost: config.fileHost || undefined,
+        fileHost: config.fileHost? new URL(config.fileHost).origin : undefined,
         NO_SANDBOX: NO_SANDBOX,
         httpSafePort: httpSafePort,
         websocketPort: config.websocketPort,