diff --git a/lib/internal/navigator.js b/lib/internal/navigator.js
index bfd2813414b26d..5b29a098fcd0d9 100644
--- a/lib/internal/navigator.js
+++ b/lib/internal/navigator.js
@@ -2,6 +2,8 @@
 
 const {
   ObjectDefineProperties,
+  StringPrototypeIndexOf,
+  StringPrototypeSlice,
   Symbol,
 } = primordials;
 
@@ -23,7 +25,7 @@ const nodeVersion = process.version;
 class Navigator {
   // Private properties are used to avoid brand validations.
   #availableParallelism;
-  #userAgent = `Node.js/${nodeVersion.slice(1, nodeVersion.indexOf('.'))}`;
+  #userAgent = `Node.js/${StringPrototypeSlice(nodeVersion, 1, StringPrototypeIndexOf(nodeVersion, '.'))}`;
 
   constructor() {
     if (arguments[0] === kInitialize) {