diff --git a/cli.js b/cli.js
new file mode 100755
index 00000000..dd2e19de
--- /dev/null
+++ b/cli.js
@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+const fs = require('fs')
+const globby = require('globby')
+const sortPackageJson = require('.')
+
+const isCheckFlag = argument => argument === '--check' || argument === '-c'
+
+const cliArguments = process.argv.slice(2)
+const isCheck = cliArguments.some(isCheckFlag)
+
+const patterns = cliArguments.filter(argument => !isCheckFlag(argument))
+
+if (!patterns.length) {
+  patterns[0] = 'package.json'
+}
+
+const files = globby.sync(patterns)
+
+if (files.length === 0) {
+  console.log('No matching files.')
+  process.exit(1)
+}
+
+let notSortedFiles = 0
+
+files.forEach(file => {
+  const packageJson = fs.readFileSync(file, 'utf8')
+  const sorted = sortPackageJson(packageJson)
+
+  if (sorted !== packageJson) {
+    if (isCheck) {
+      notSortedFiles++
+      console.log(file)
+    } else {
+      fs.writeFileSync(file, sorted, 'utf8')
+      console.log(`${file} is sorted!`)
+    }
+  }
+})
+
+if (isCheck) {
+  console.log()
+  if (notSortedFiles) {
+    console.log(
+      notSortedFiles === 1
+        ? `${notSortedFiles} of ${files.length} matched file is not sorted.`
+        : `${notSortedFiles} of ${files.length} matched files are not sorted.`,
+    )
+  } else {
+    console.log(
+      files.length === 1
+        ? `${files.length} matched file is sorted.`
+        : `${files.length} matched files are sorted.`,
+    )
+  }
+  process.exit(notSortedFiles)
+}
diff --git a/index.js b/index.js
old mode 100755
new mode 100644
index e6a18129..5e905521
--- a/index.js
+++ b/index.js
@@ -1,8 +1,6 @@
-#!/usr/bin/env node
 const sortObjectKeys = require('sort-object-keys')
 const detectIndent = require('detect-indent')
 const detectNewline = require('detect-newline').graceful
-const globby = require('globby')
 const gitHooks = require('git-hooks-list')
 
 const hasOwnProperty = (object, property) =>
@@ -279,59 +277,3 @@ function sortPackageJson(jsonIsh, options = {}) {
 module.exports = sortPackageJson
 module.exports.sortPackageJson = sortPackageJson
 module.exports.sortOrder = defaultSortOrder
-
-if (require.main === module) {
-  const fs = require('fs')
-  const isCheckFlag = argument => argument === '--check' || argument === '-c'
-
-  const cliArguments = process.argv.slice(2)
-  const isCheck = cliArguments.some(isCheckFlag)
-
-  const patterns = cliArguments.filter(argument => !isCheckFlag(argument))
-
-  if (!patterns.length) {
-    patterns[0] = 'package.json'
-  }
-
-  const files = globby.sync(patterns)
-
-  if (files.length === 0) {
-    console.log('No matching files.')
-    process.exit(1)
-  }
-
-  let notSortedFiles = 0
-
-  files.forEach(file => {
-    const packageJson = fs.readFileSync(file, 'utf8')
-    const sorted = sortPackageJson(packageJson)
-
-    if (sorted !== packageJson) {
-      if (isCheck) {
-        notSortedFiles++
-        console.log(file)
-      } else {
-        fs.writeFileSync(file, sorted, 'utf8')
-        console.log(`${file} is sorted!`)
-      }
-    }
-  })
-
-  if (isCheck) {
-    console.log()
-    if (notSortedFiles) {
-      console.log(
-        notSortedFiles === 1
-          ? `${notSortedFiles} of ${files.length} matched file is not sorted.`
-          : `${notSortedFiles} of ${files.length} matched files are not sorted.`,
-      )
-    } else {
-      console.log(
-        files.length === 1
-          ? `${files.length} matched file is sorted.`
-          : `${files.length} matched files are sorted.`,
-      )
-    }
-    process.exit(notSortedFiles)
-  }
-}
diff --git a/package.json b/package.json
index c2cbfef0..d1b0b3dc 100644
--- a/package.json
+++ b/package.json
@@ -19,15 +19,16 @@
   "author": "Keith Cirkel <npm@keithcirkel.co.uk> (http://keithcirkel.co.uk/)",
   "files": [
     "index.js",
-    "index.d.ts"
+    "index.d.ts",
+    "cli.js"
   ],
   "main": "index.js",
   "types": "index.d.ts",
-  "bin": "index.js",
+  "bin": "cli.js",
   "scripts": {
     "lint": "eslint .",
     "semantic-release": "semantic-release",
-    "sort-package-json": "node index.js package.json --check",
+    "sort-package-json": "node cli.js package.json --check",
     "test": "node test.js"
   },
   "husky": {
diff --git a/test.js b/test.js
index bb7323d1..2adbab5b 100644
--- a/test.js
+++ b/test.js
@@ -623,22 +623,25 @@ for (const field of [
   ])
 }
 
+// CLI should be executable
+fs.accessSync('./cli.js', fs.constants.X_OK)
+
 // CLI `--check` flag tests
 
 // make sure `--check` not fixing file
 // support `-c` as well
-const orignal = fs.readFileSync('fixtures/not-sorted-1/package.json', 'utf8')
+const original = fs.readFileSync('fixtures/not-sorted-1/package.json', 'utf8')
 execFile(
   'node',
-  ['index.js', 'fixtures/not-sorted-1/package.json', '-c'],
+  ['cli.js', 'fixtures/not-sorted-1/package.json', '-c'],
   (error, stdout, stderr) => {
     assert.notStrictEqual(
-      orignal,
-      sortPackageJson(orignal),
+      original,
+      sortPackageJson(original),
       'fixtures/not-sorted-1/package.json should be a unsorted file.',
     )
     assert.strictEqual(
-      orignal,
+      original,
       fs.readFileSync('fixtures/not-sorted-1/package.json', 'utf8'),
       'file should not fixed when --check is enabled.',
     )
@@ -657,7 +660,7 @@ execFile(
 
 execFile(
   'node',
-  ['index.js', 'fixtures/not-sorted-*/package.json', '--check'],
+  ['cli.js', 'fixtures/not-sorted-*/package.json', '--check'],
   (error, stdout, stderr) => {
     assert.strictEqual(error.code, 2)
     assert.strictEqual(stderr, '')
@@ -678,7 +681,7 @@ execFile(
 
 execFile(
   'node',
-  ['index.js', 'fixtures/sorted-1/package.json', '--check'],
+  ['cli.js', 'fixtures/sorted-1/package.json', '--check'],
   (error, stdout, stderr) => {
     assert.strictEqual(error, null)
     assert.strictEqual(stderr, '')
@@ -688,7 +691,7 @@ execFile(
 
 execFile(
   'node',
-  ['index.js', 'fixtures/sorted-*/package.json', '--check'],
+  ['cli.js', 'fixtures/sorted-*/package.json', '--check'],
   (error, stdout, stderr) => {
     assert.strictEqual(error, null)
     assert.strictEqual(stderr, '')
@@ -698,7 +701,7 @@ execFile(
 
 execFile(
   'node',
-  ['index.js', 'fixtures/*/package.json', '--check'],
+  ['cli.js', 'fixtures/*/package.json', '--check'],
   (error, stdout, stderr) => {
     assert.strictEqual(error.code, 3)
     assert.strictEqual(stderr, '')
@@ -725,7 +728,7 @@ execFile(
 
 execFile(
   'node',
-  ['index.js', 'NONE_EXISTS_FILE', '--check'],
+  ['cli.js', 'NONE_EXISTS_FILE', '--check'],
   (error, stdout, stderr) => {
     assert.strictEqual(error.code, 1)
     assert.strictEqual(stderr, '')
@@ -737,7 +740,7 @@ execFile(
 execFile(
   'node',
   [
-    'index.js',
+    'cli.js',
     'fixtures/not-sorted-1/package.json',
     'fixtures/not-sorted-1/**/package.json',
     '--check',