diff --git a/blocks/http/test/pre.js b/blocks/http/test/pre.js
index 4a1984026..3c6262717 100644
--- a/blocks/http/test/pre.js
+++ b/blocks/http/test/pre.js
@@ -8,6 +8,7 @@
 var http = require("http");
 // this requires xhr2 to be installed, please run: npm install xhr2
 // see: https://github.com/emscripten-core/emscripten/issues/21158
+/*global XMLHttpRequest:writable*/
 XMLHttpRequest = require('xhr2');
 
 const server = http.createServer((req, res) => {
@@ -44,4 +45,6 @@ var stopServer = () => {
 
 if (process.argv.at(-1) == "start") {
     startServer();
+} else if (process.argv.at(-1) == "stop") {
+    stopServer();
 }