diff --git a/index.d.ts b/index.d.ts
index 1ef5de8..b3dd972 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -38,8 +38,11 @@ declare module "agentkeepalive" {
   }
 
   namespace internal {
-    export class HttpsAgent extends internal {
+    export class HttpsAgent extends https.Agent {
       constructor(opts?: HttpsOptions);
+      readonly statusChanged: boolean;
+      createSocket(req: http.IncomingMessage, options: https.RequestOptions, cb: Function): void;
+      getCurrentStatus(): AgentStatus;
     }
   }