diff --git a/lib/RateLimiterRes.js b/lib/RateLimiterRes.js
index 615efdb..e610b9b 100644
--- a/lib/RateLimiterRes.js
+++ b/lib/RateLimiterRes.js
@@ -1,5 +1,3 @@
-const util = require('util');
-
 module.exports = class RateLimiterRes {
   constructor(remainingPoints, msBeforeNext, consumedPoints, isFirstInDuration) {
     this.remainingPoints = typeof remainingPoints === 'undefined' ? 0 : remainingPoints; // Remaining points in current duration
@@ -52,7 +50,7 @@ module.exports = class RateLimiterRes {
     };
   }
 
-  [util.inspect.custom]() {
+  [Symbol.for("nodejs.util.inspect.custom")]() {
     return this._getDecoratedProperties();
   }