diff --git a/browser/fs.js b/browser/fs.js
index 654315f..be97954 100644
--- a/browser/fs.js
+++ b/browser/fs.js
@@ -1,5 +1,6 @@
 const nope = method => `Cannot use fs.${method} inside browser`;
 
+export const isFile = () => false;
 export const readdirSync = nope( 'readdirSync' );
 export const readFileSync = nope( 'readFileSync' );
 export const writeFile = nope( 'writeFile' );