diff --git a/spec/atom-portable-spec.coffee b/spec/atom-portable-spec.coffee
index 2e4feae88..50e7425c0 100644
--- a/spec/atom-portable-spec.coffee
+++ b/spec/atom-portable-spec.coffee
@@ -5,9 +5,9 @@ rimraf = require "rimraf"
 AtomPortable = require "../src/browser/atom-portable"
 
 describe "Set Portable Mode", ->
-  portableAtomHomePath = path.join(path.dirname(process.execPath), "../.atom").toString()
+  portableAtomHomePath = path.join(path.dirname(process.execPath), '..', '.atom')
   portableAtomHomeNaturallyExists = fs.existsSync(portableAtomHomePath)
-  portableAtomHomeBackupPath = portableAtomHomePath + ".temp"
+  portableAtomHomeBackupPath = "#{portableAtomHomePath}.temp"
 
   beforeEach ->
     fs.renameSync(portableAtomHomePath, portableAtomHomeBackupPath) if fs.existsSync(portableAtomHomePath)
@@ -19,6 +19,7 @@ describe "Set Portable Mode", ->
       rimraf.sync(portableAtomHomePath) if fs.existsSync(portableAtomHomePath)
     rimraf.sync(portableAtomHomeBackupPath) if fs.existsSync(portableAtomHomeBackupPath)
 
+
   it "creates portable home directory", ->
     AtomPortable.setPortable(process.env.ATOM_HOME)
     expect(fs.existsSync(portableAtomHomePath)).toBe true
diff --git a/src/browser/atom-portable.coffee b/src/browser/atom-portable.coffee
index f845f05d0..8e044ff24 100644
--- a/src/browser/atom-portable.coffee
+++ b/src/browser/atom-portable.coffee
@@ -6,7 +6,7 @@ module.exports =
 class AtomPortable
   @portableAtomHomePath: ->
     execDirectoryPath = path.dirname(process.execPath)
-    return path.join(execDirectoryPath, "../.atom/")
+    return path.join(execDirectoryPath, '..', '.atom')
 
   @setPortable: (existingAtomHome) ->
     fs.copySync(existingAtomHome, @portableAtomHomePath())