diff --git a/lib/constructor.js b/lib/constructor.js
index 711221f2..9299682e 100644
--- a/lib/constructor.js
+++ b/lib/constructor.js
@@ -288,7 +288,8 @@ const Sharp = function (input, options) {
   this.options.input = this._createInputDescriptor(input, options, { allowStream: true });
   return this;
 };
-util.inherits(Sharp, stream.Duplex);
+Object.setPrototypeOf(Sharp.prototype, stream.Duplex.prototype);
+Object.setPrototypeOf(Sharp, stream.Duplex);
 
 /**
  * Take a "snapshot" of the Sharp instance, returning a new instance.