diff --git a/lib/http-worker.js b/lib/http-worker.js
index 9d264ab6c..059ec7d8f 100644
--- a/lib/http-worker.js
+++ b/lib/http-worker.js
@@ -158,6 +158,7 @@ var setHeaders = function (req, res) {
 };
 
 const Express = require("express");
+Express.static.mime.define({'application/wasm': ['wasm']});
 var app = Express();
 
 (function () {