diff --git a/docker/config.prod.ts b/docker/config.prod.ts
index fa05046..42dd1ea 100644
--- a/docker/config.prod.ts
+++ b/docker/config.prod.ts
@@ -1,5 +1,5 @@
 const config: IConfig = {
-  serve: `http://${location.hostname}:38080`,
+  serve: `http://${window.location.hostname}:38080`,
   keys: ['some secret hurr'],
   session: {
     key: 'koa:sess',