diff --git a/get-prefix.js b/get-prefix.js
index ef0e937..97b4cc0 100644
--- a/get-prefix.js
+++ b/get-prefix.js
@@ -2,7 +2,7 @@
 
 const BB = require('bluebird')
 
-const fs = BB.promisifyAll(require('fs'))
+const statAsync = BB.promisify(require('fs').stat)
 const path = require('path')
 
 module.exports = getPrefix
@@ -44,7 +44,7 @@ function getPrefix (current, root) {
 }
 
 function fileExists (f) {
-  return fs.statAsync(f).catch({code: 'ENOENT'}, () => false)
+  return statAsync(f).catch({code: 'ENOENT'}, () => false)
 }
 
 function isRootPath (p) {
diff --git a/index.js b/index.js
index 1bcad39..a530aec 100755
--- a/index.js
+++ b/index.js
@@ -3,7 +3,6 @@
 
 const BB = require('bluebird')
 
-const autoFallback = require('./auto-fallback.js')
 const child = require('./child')
 const getPrefix = require('./get-prefix.js')
 const parseArgs = require('./parse-args.js')
@@ -22,7 +21,9 @@ module.exports = main
 function main (argv) {
   const shell = argv['shell-auto-fallback']
   if (shell || shell === '') {
-    const fallback = autoFallback(shell, process.env.SHELL, argv)
+    const fallback = require('./auto-fallback.js')(
+      shell, process.env.SHELL, argv
+    )
     if (fallback) {
       console.log(fallback)
       process.exit(0)