diff --git a/lib/standalone.js b/lib/standalone.js
index 45b085b..8ff94f4 100644
--- a/lib/standalone.js
+++ b/lib/standalone.js
@@ -169,7 +169,12 @@ function lexHelper(obj, app) {
 }
 
 function LEX(obj, app) {
-  var https = require('http2');
+  var https;
+  try {
+    https = require('spdy');
+  } catch(e) {
+    https = require('https');
+  }
   var http = require('http');
 
   function listen(plainPorts, tlsPorts, onListening) {