diff --git a/src/rest/APIRequest.js b/src/rest/APIRequest.js
index 0a5faf1..eca6bc5 100644
--- a/src/rest/APIRequest.js
+++ b/src/rest/APIRequest.js
@@ -32,6 +32,9 @@ class APIRequest {
       if (typeof this.client.options.proxy === 'string' && this.client.options.proxy.length > 0) {
         const proxy = require('proxy-agent');
         agent = new proxy(this.client.options.proxy);
+      } else if (this.client.options.http.agent instanceof https.Agent) {
+        agent = this.client.options.http.agent;
+        agent.keepAlive = true;
       } else {
         agent = new https.Agent({ ...this.client.options.http.agent, keepAlive: true });
       }