diff --git a/src/server/index.js b/src/server/index.js
index ec833807e9bcd3b8638fcb9acd7623a117ee7648..efeb2c62bcf770a32891ff59cd11275068f052a8 100644
--- a/src/server/index.js
+++ b/src/server/index.js
@@ -24,7 +24,7 @@ import querystring from 'querystring'
 createBackendSearchConfig().then(backendSearchConfig => {
   const DEFAULT_PORT = 3001
   const app = express()
-  app.set('port', process.env.PORT || DEFAULT_PORT)
+  app.set('port', process.env.SAMPO_UI_EXPRESS_PORT || DEFAULT_PORT)
   app.use(bodyParser.json())
   app.disable('x-powered-by')