diff --git a/lib/restler.js b/lib/restler.js
index 74bd41f..88f2b28 100644
--- a/lib/restler.js
+++ b/lib/restler.js
@@ -79,6 +79,11 @@ function Request(uri, options) {
     method: this.options.method,
     headers: this.headers,
     rejectUnauthorized: this.options.rejectUnauthorized,
+    passphrase: this.options.passphrase,
+    pfx: this.options.pfx,
+    ca: this.options.ca,
+    key: this.options.key,
+    cert: this.options.cert,
     agent: this.options.agent
   });