diff --git a/lib/fs/index.js b/lib/fs/index.js
index 43529653..1821fd00 100644
--- a/lib/fs/index.js
+++ b/lib/fs/index.js
@@ -9,6 +9,7 @@ const api = [
   'chmod',
   'chown',
   'close',
+  'copyFile',
   'fchmod',
   'fchown',
   'fdatasync',
@@ -20,6 +21,7 @@ const api = [
   'link',
   'lstat',
   'mkdir',
+  'mkdtemp',
   'open',
   'readFile',
   'readdir',
@@ -33,12 +35,13 @@ const api = [
   'unlink',
   'utimes',
   'writeFile'
-]
-// Add methods that are only in some Node.js versions
-// fs.copyFile was added in Node.js v8.5.0
-typeof fs.copyFile === 'function' && api.push('copyFile')
-// fs.mkdtemp() was added in Node.js v5.10.0
-typeof fs.mkdtemp === 'function' && api.push('mkdtemp')
+].filter(key => {
+  // Some commands are not available on some systems. Ex:
+  // fs.copyFile was added in Node.js v8.5.0
+  // fs.mkdtemp was added in Node.js v5.10.0
+  // fs.lchown is not available on at least some Linux
+  return typeof fs[key] === 'function'
+})
 
 // Export all keys:
 Object.keys(fs).forEach(key => {