diff --git a/lib/http-server.js b/lib/http-server.js
index 3dc23f3..f835155 100644
--- a/lib/http-server.js
+++ b/lib/http-server.js
@@ -141,6 +141,7 @@ function createKeys (cb) {
       var opts = {
         days: 2048,
         algorithm: 'sha256',
+        keySize: 2048,
         extensions: [
           {
             name: 'subjectAltName',