diff --git a/lib/http_proxy.js b/lib/http_proxy.js
index b25746e..f3b9daf 100644
--- a/lib/http_proxy.js
+++ b/lib/http_proxy.js
@@ -32,6 +32,7 @@ class HttpProxy {
     const defaultOptions = {
       timeout: this.config.timeout,
       agent: this.config.agent,
+      httpsAgent: this.config.httpsAgent,
       streaming: true,
       followRedirect: false,
       beforeResponse: undefined,