diff --git a/nbt.js b/nbt.js
index 1346e32..a80b461 100644
--- a/nbt.js
+++ b/nbt.js
@@ -1,7 +1,9 @@
 'use strict';
 
-const fs = require('fs');
-const zlib = require('zlib');
+let fs;
+try { fs = require('fs'); } catch (e) { /* Not running on Node.js */ }
+let zlib;
+try { zlib = require('zlib'); } catch (e) { /* Not running on Node.js */ }
 
 const Tag = require('./lib/base_tag');