diff --git a/index.js b/index.js
index 2dc4a07..44bb7b6 100644
--- a/index.js
+++ b/index.js
@@ -1,8 +1,11 @@
+const tls = require('tls')
+
 module.exports = (srv, hostname = 'localhost') => new Promise((resolve, reject) => {
   srv.on('error', reject)
 
   srv.listen(() => {
     const {port} = srv.address()
-    resolve(`http://${hostname}:${port}`)
+    const protocol = (srv instanceof tls.Server) ? 'https' : 'http'
+    resolve(`${protocol}://${hostname}:${port}`)
   })
 })