diff --git a/package.json b/package.json
index cfb9ea8..79b8d66 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "uuid": "^9.0.0"
   },
   "devDependencies": {
+    "@babel/plugin-proposal-private-methods": "^7.18.6",
     "@compodoc/compodoc": "^1.1.9",
     "@types/execa": "^0.9.0",
     "@types/extend": "^3.0.1",
diff --git a/src/http2.ts b/src/http2.ts
index d351ae1..e5802ff 100644
--- a/src/http2.ts
+++ b/src/http2.ts
@@ -38,7 +38,7 @@ const DEBUG = !!process.env.HTTP2_DEBUG;
  */
 export interface SessionData {
   session: http2.ClientHttp2Session;
-  timeoutHandle?: NodeJS.Timer;
+  timeoutHandle?: NodeJS.Timeout;
 }
 
 /**