diff --git a/lib/node_modules/@stdlib/fs/read-file/examples/index.js b/lib/node_modules/@stdlib/fs/read-file/examples/index.js
index 1de1f5fcbdc8..a12df753afad 100644
--- a/lib/node_modules/@stdlib/fs/read-file/examples/index.js
+++ b/lib/node_modules/@stdlib/fs/read-file/examples/index.js
@@ -18,6 +18,7 @@
 
 'use strict';
 
+var isError = require( '@stdlib/assert/is-error' );
 var readFile = require( './../lib' );
 
 /* Sync */
@@ -25,7 +26,7 @@ var readFile = require( './../lib' );
 var file = readFile.sync( __filename, 'utf8' );
 // returns <string>
 
-console.log( file instanceof Error );
+console.log( isError( file ) );
 // => false
 
 file = readFile.sync( 'beepboop', {
@@ -33,7 +34,7 @@ file = readFile.sync( 'beepboop', {
 });
 // returns <Error>
 
-console.log( file instanceof Error );
+console.log( isError( file ) );
 // => true
 
 /* Async */